Malawians hold flags as U.S. first lady Melania Trump arrives in Lilongwe, Malawi, October 4, 2018. REUTERS/Carlo Allegri

Malawians hold flags as U.S. first lady Melania Trump arrives in Lilongwe, Malawi, October 4, 2018. REUTERS/Carlo Allegri

U.S. first lady Melania Trump greets Malawian first lady Gertrude Maseko as she arrives in Lilongwe, Malawi, October 4, 2018. REUTERS/Carlo Allegri

An Malawi Airlines Boeing 737-700 aircraft is refilled at the OR Tambo International Airport in Johannesburg, South Africa, March 8, 2017. REUTERS/Siphiwe Sibeko

An Malawi Airlines aircraft is refilled at the OR Tambo International Airport in Johannesburg, South Africa, March 8, 2017. REUTERS/Siphiwe Sibeko

A Malawian trader counts money as he sells maize near the capital Lilongwe, Malawi February 1, 2016. REUTERS/Mike Hutchings/File Photo

Malawian Saw-wa, who lost her daughter, cries on the phone in front of the burnt building at the Pitakiatwittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. REUTERS/Athit Perawongmetha

Malawian Saw-wa, 33, (L) and Yupin Saw-wa, 28 who lost their daughters, cry near a burnt building at the Pitakkiat Wittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. REUTERS/Athit Perawongmetha

Malawian Saw-wa, 33, who lost her daughter, cries near a burnt building at the Pitakkiat Wittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. REUTERS/Athit Perawongmetha

Malawian Saw-wa, 33, (L) and Yupin Saw-wa, 28 who lost their daughters, cry near a burnt building at the Pitakkiat Wittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. REUTERS/Athit Perawongmetha

Malawian Saw-wa, 33, (L) who lost her daughter, cries near a burnt building at the Pitakkiat Wittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. REUTERS/Athit Perawongmetha

A woman carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near Malawi's capital Lilongwe, February 3, 2016. REUTERS/Mike Hutchings/File Photo

A man carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near Malawi's capital Lilongwe, February 3, 2016. REUTERS/Mike Hutchings/File Photo

Rain clouds loom as Malawian subsistence farmer Louise Abele carries maize she has bought to feed her family near the capital Lilongwe, Malawi January 31, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken January 31, 2016. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

A Malawian trader counts money as he sells maize near the capital Lilongwe, Malawi February 1, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken February 1, 2016. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

Rain clouds loom as Malawian subsistence farmer Louise Abele carries maize she has bought to feed her family near the capital Lilongwe, Malawi January 31, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken January 31, 2016. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

Malawian subsistence farmer Rozaria Hamiton plants sweet potatoes near the capital Lilongwe, Malawi February 1, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken February 1, 2016. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

Malawian subsistence farmers Simon Sikazwe (L) and Cecelia Kazibuta (R) stand beside communal maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings

Malawian subsistence farmer Simon Sikazwe stands beside communal maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings

A Malawian subsistence farmer surveys her maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings

A Malawian subsistence farmer works his maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings

A Malawian subsistence farmer surveys communal maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings

A Malawian subsistence farmer surveys her maize fields in Dowa near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Progamme (WFP). REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

A Malawian man carries food aid distributed by the United Nations World Food Progamme (WFP) through maize fields in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

Malawian men prepare to transport food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian man transports food aid distributed by the United Nations World Food Progamme (WFP) through maize fields in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian man carries food aid distributed by the United Nations World Food Progamme (WFP) through maize fields in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

Malawians queue for food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

Malawian women wait with food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian man carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian woman carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian woman carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

Malawians queue for food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

Malawians queue for food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

A Malawian woman carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian man carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian man carries food aid distributed by the United Nations World Food Progamme (WFP) in Mzumazi village near the capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A worker waits to distribute food aid for the United Nations World Food Progamme (WFP) in Mzumazii village near Malawi's capital Lilongwe, February 3, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the WFP. REUTERS/Mike Hutchings

A Malawian child catches raindrops during a brief downpour in Ngozi village near the capital Lilongwe, February 2, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

Storm clouds hover as a cyclist rides past a field of maize after late rains near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

Storm clouds hang over a rainbow as a motorcyclist rides past a field of maize after late rains near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

A man uses an umbrella as late rains fall near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A child sits at a water distribution point near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

Subsistence farmer Nelson Sikanawawe walks past his field of maize after late rains near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A Malawian trader sells maize near the capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A dog walks past maize for sale near the capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

Storm clouds hover as cyclists pass a field of maize after late rains near Malawi's capital Lilongwe, February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

Malawian subsistence farmer tend their fields near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). Picture taken with fish eye lens. REUTERS/Mike Hutchings

Malawian subsistence farmer Rozaria Hamiton plants sweet potatoes near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs.About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). Picture taken with fish eye lens. REUTERS/Mike Hutchings

A Malawian subsistence farmer carries a bag of fertilizer near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A Malawian trader sells maize near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A Malawian child looks on as a trader sells maize near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A Malawian trader counts money as he sells maize near the capital Lilongwe, Malawi February 1, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). REUTERS/Mike Hutchings

A Malawian child stands in front of a maize crop near the capital Lilongwe, Malawi January 31, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). Picture taken January 31, 2016. REUTERS/Mike Hutchings

Rain clouds loom as Malawian subsistence farmer Louise Abele carries maize she has bought to feed her family near the capital Lilongwe, Malawi January 31, 2016. Late rains in Malawi threaten the staple maize crop and have pushed prices to record highs. About 14 million people face hunger in Southern Africa because of a drought that has been exacerbated by an El Nino weather pattern, according to the United Nations World Food Programme (WFP). Picture taken January 31, 2016. REUTERS/Mike Hutchings

A Malawian man washes using a bucket on a soccer field adjacent to a camp for those affected by anti-immigrant violence in Chatsworth south of Durban, April 24, 2015. A wave of anti-immigrant violence has so far claimed seven lives in trouble spots in Durban and Johannesburg, to where the government announced the deployment of defence forces on Tuesday. REUTERS/Rogan Ward

Malawian nationals sit in a queue to register with immigration officials at a camp for those affected by anti-immigrant violence in Chatsworth south of Durban, April 24, 2015. A wave of anti-immigrant violence has so far claimed seven lives in trouble spots in Durban and Johannesburg, to where the government announced the deployment of defence forces on Tuesday. REUTERS/Rogan Ward

Malawian nationals sit in a queue to register with immigration officials at a camp for those affected by anti-immigrant violence in Chatsworth south of Durban, April 23, 2015. A wave of anti-immigrant violence has so far claimed seven lives in trouble spots in Durban and Johannesburg, to where the government announced the deployment of defence forces on Tuesday. REUTERS/Rogan Ward

Malawian nationals sit in a queue to register with immigration officials at a camp for those affected by anti-immigrant violence in Chatsworth south of Durban, April 23, 2015. A wave of anti-immigrant violence has so far claimed seven lives in trouble spots in Durban and Johannesburg, to where the government announced the deployment of defence forces on Tuesday. REUTERS/Rogan Ward TPX IMAGES OF THE DAY

Malawian nationals sit in a queue to register with immigration officials at a camp for those affected by anti-immigrant violence in Chatsworth south of Durban, April 23, 2015. A wave of anti-immigrant violence has so far claimed seven lives in trouble spots in Durban and Johannesburg, to where the government announced the deployment of defence forces on Tuesday. REUTERS/Rogan Ward