A general view shows refugee tents erected at the Syrian side of the Israeli Syrian border as it is seen from the Israeli-occupied Golan Heights, Israel, July 17, 2018. REUTERS/Ronen Zvulun 

A general view shows refugee tents erected at the Syrian side of the Israeli Syrian border as it is seen from the Israeli-occupied Golan Heights, Israel, July 17, 2018. REUTERS/Ronen Zvulun 

A general view of refugee tents erected in Syria and smoke following an explosion in the background are seen from the Israeli-occupied Golan Heights near the Israeli Syrian border, July 17, 2018. REUTERS/Ronen Zvulun 

A shepherd walks next to the tents erected for refugees in Syria as it is seen from the Israeli-occupied Golan Heights, Israel July 17, 2018. REUTERS/Ronen Zvulun 

A general view shows refugee tents erected in Syria seen from the Israeli-occupied Golan Heights, Israel July 17, 2018. REUTERS/Ronen Zvulun 

A general view shows the fence of the border line between Israel and Syria and refugee tents erected in the background at the Syrian side as it is seen from the Israeli-occupied Golan Heights, Israel July 7, 2018. REUTERS/Ronen Zvulun 

A migrant intercepted aboard a wooden boat off the coast in the Strait of Gibraltar, runs on rocks after escaping from Spanish civil guards after arriving on a rescue boat at the port of Tarifa, southern Spain July 6, 2018. REUTERS/Jon Nazca 

A migrant intercepted aboard a dinghy off the coast in the Strait of Gibraltar, leans his arm on a rescue boat after arriving at the port of Algeciras, southern Spain July 6, 2018. REUTERS/Jon Nazca 

A person deported from the U.S. waits to be processed at an immigration facility in San Salvador, El Salvador, July 3, 2018. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY 

A general view of refugee tents erected in Syria near the Israeli borderline as it seen from the Israeli-occupied Golan Heights, Israel July 3, 2018. REUTERS/Ronen Zvulun 

A general view of refugee tents erected in Syria near the Israeli borderline as it seen from the Israeli-occupied Golan Heights, Israel July 3, 2018. REUTERS/Ronen Zvulun 

A general view of refugee tents erected in Syria near the Israeli borderline as it seen from the Israeli-occupied Golan Heights, Israel July 3, 2018. REUTERS/Ronen Zvulun 

A general view of refugee tents erected in Syria near the Israeli borderline as it seen from the Israeli-occupied Golan Heights, Israel July 3, 2018. REUTERS/Ronen Zvulun 

A general view of refugee tents erected in Syria near the Israeli borderline as it seen from the Israeli-occupied Golan Heights, Israel July 3, 2018. REUTERS/Ronen Zvulun 

A German flag flutters in Berlin, Germany, July 2, 2018. REUTERS/Hannibal Hanschke 

A genral view of refugee tents erected in Syria seen from the Israeli-occupied Golan Heights, Israel July 1, 2018. REUTERS/Ammar Awad 

A genral view of refugee tents erected in Syria seen from the the Israeli-occupied Golan Heights, Israel July 1, 2018. REUTERS/Ammar Awad 

A genral view of refugee tents erected in Syria seen from the the Israeli-occupied Golan Heights, Israel July 1, 2018. REUTERS/Ammar Awad 

A general view shows the Strait of Gibraltar and a mountain of Morocco pictured from a tourist view in Tarifa, southern Spain, June 29, 2018. Picture taken June 29, 2018. REUTERS/Jon Nazca 

A general view shows the Strait of Gibraltar and a mountain of Morocco pictured from a tourist view in Tarifa, southern Spain, June 29, 2018. Picture taken June 29, 2018. REUTERS/Jon Nazca 

A migrant intercepted aboard a dinghy off the coast in the Strait of Gibraltar, rests after arriving on a rescue boat at the port of Tarifa, southern Spain, June 30, 2018. REUTERS/Jon Nazca 

A French policeman works at the border check point Saint-Ludovic at the Franco-Italian border in Menton, France, June 29, 2018. REUTERS/Eric Gaillard 

The hand of a migrant woman of a group intercepted aboard dinghies off the coast in the Strait of Gibraltar is seen as she rests in a sport center after arriving on a rescue boat at the port of Barbate, southern Spain, June 27, 2018. REUTERS/Jon Nazca TPX IMAGES OF THE DAY 

The hands of a migrant of a group intercepted aboard a dinghy off the coast in the Strait of Gibraltar, are seen after the arrival of a rescue boat at the port of Tarifa, southern Spain, June 27, 2018. REUTERS/Jon Nazca 

The wet feet of a migrant of a group intercepted aboard a dinghy off the coast in the Strait of Gibraltar, are seen at the port of Tarifa, southern Spain, June 27, 2018. REUTERS/Jon Nazca 

The hand of a migrant woman of a group intercepted aboard dinghies off the coast in the Strait of Gibraltar is seen as she rests in a sport center after arriving on a rescue boat at the port of Barbate, southern Spain, June 27, 2018. REUTERS/Jon Nazca 

A migrant of a group intercepted aboard a dinghy off the coast in the Strait of Gibraltar, rests after arriving on a rescue boat at the port of Tarifa, southern Spain, June 27, 2018. REUTERS/Jon Nazca 

A Rohingya refugee is seen with tar on his arm after painting a fishing boat with a fresh coat of tar on Shamlapur beach in Cox's Bazaar, Bangladesh, March 29, 2018. REUTERS/Clodagh Kilcoyne 

Nightlights shine on fishing boats on Shamplapur beach near a Rohingya refugee camp in Cox's Bazar, Bangladesh, March 22, 2018. REUTERS/Clodagh Kilcoyne 

Policemen attend an exercise of to prevent migrants from crossing the Austrian border from Slovenia in Spielfeld, Austria June 26, 2018. REUTERS/Lisi Niesner TPX IMAGES OF THE DAY 

A traffic sign is seen between Kiefersfelden and the Austrian city Kufstein, Germany June 21, 2018. Picture taken June 21, 2018. REUTERS/Michaela Rehle 

A traffic sign "Police checkpoint" is seen between Kiefersfelden and the Austrian city Kufstein, Germany June 21, 2018. Picture taken June 21, 2018. REUTERS/Michaela Rehle 

A cat watches as migrants, part of a group intercepted aboard a dinghy off the coast in the Mediterranean Sea, stand after arriving on a rescue boat at the port of Motril, Spain June 22, 2018. REUTERS/Jon Nazca 

Migrants, part of a group intercepted aboard a dinghy off the coast in the Mediterranean Sea, joke after arriving on a rescue boat at the port of Malaga, Spain June 22, 2018. REUTERS/Jon Nazca 

The border fence separating Spain's northern enclave Ceuta and Morocco is seen from Ceuta, Spain, June 21, 2018. REUTERS/Juan Medina 

The border fence separating Spain's northern enclave Ceuta and Morocco is seen from Ceuta, Spain, June 21, 2018. REUTERS/Juan Medina 

The border fence separating Spain's northern enclave Ceuta and Morocco is seen from Ceuta, Spain, June 20, 2018. REUTERS/Juan Medina 

A migrant, part of a group intercepted aboard three dinghies off the coast in the Mediterranean Sea, walks as he leaves a rescue boat upon arrival at the port of Malaga, Spain June 18, 2018. REUTERS/Jon Nazca 

A migrant, part of a group intercepted aboard three dinghies off the coast in the Mediterranean Sea, leaves a rescue boat upon arrival at the port of Malaga, Spain June 18, 2018. REUTERS/Jon Nazca 

A relative of a Palestinian, who was killed by Israeli troops, reacts at a hospital in Ramallah, in the occupied West Bank June 6, 2018. REUTERS/Mohamad Torokman TPX IMAGES OF THE DAY 

A relative of a Palestinian, who was killed by Israeli troops, reacts at a hospital in Ramallah, in the occupied West Bank June 6, 2018. REUTERS/Mohamad Torokman 

A relative of a Palestinian, who was killed by Israeli troops, reacts at a hospital in Ramallah, in the occupied West Bank June 6, 2018. REUTERS/Mohamad Torokman 

A Venezuelan migrant is fingerprinted during registration at the federal police headquarters in Boa Vista, Brazil May 3, 2018. Picture taken May 3, 2018. REUTERS/Ueslei Marcelino 

A Venezuelan migrant is fingerprinted during registration at the federal police headquarters in Boa Vista, Brazil May 3, 2018. Picture taken May 3, 2018. REUTERS/Ueslei Marcelino 

Two Greek Army watchtowers (L) and one Turkish Army watchtower are seen at the borderline between Greece and Turkey, near the village of Nea Vyssa, Greece, April 30, 2018. REUTERS/Alkis Konstantinidis SEARCH "EVROS MIGRANTS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A damaged inflatable boat used by refugees and migrants to cross the Evros river, is seen at the banks of the river on the Turkish side, May 1, 2018. Picture taken from the Greek side of the border. REUTERS/Alkis Konstantinidis SEARCH "EVROS MIGRANTS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

The shoes of a transgender woman traveling with a caravan of migrants from Central America are seen at a camp near the San Ysidro checkpoint, after U.S. border authorities allowed the first small group of women and children entry from Mexico overnight, in Tijuana, Mexico May 1, 2018. REUTERS/Edgard Garrido 

A foot of a member of a caravan of migrants from Central America is pictured as he sleeps near the San Ysidro checkpoint after a small group of fellow migrants entered the United States border and customs facility, where they are expected to apply for asylum, in Tijuana, Mexico April 29, 2018. REUTERS/Edgard Garrido 

Members of a caravan of migrants from Central America hug as a first group is allowed to enter the United States border and customs facility, where they are expected to apply for asylum, in Tijuana, Mexico April 29, 2018. REUTERS/Edgard Garrido 

A supporter waves a Honduran flag on the U.S. side of the U.S.-Mexico border wall at Border Field State Park as members of a migrant caravan from Central America stand on the other side, in San Diego, California, U.S. April 29, 2018. REUTERS/Lucy Nicholson 

Members of a caravan of migrants from Central America ride on a bus past the border fence between Mexico and the U.S., to gather in a park prior to preparations for an asylum request in the U.S., in Tijuana, Mexico April 29, 2018. REUTERS/Edgard Garrido 

A woman holds a candle during an opposition rally to mark the anniversary of the Chernobyl nuclear disaster in Minsk, Belarus April 26, 2018. REUTERS/Vasily Fedosenko 

A migrant, part of a group intercepted aboard two dinghies off the coast in the Mediterranean Sea, rests on a rescue boat upon arrival at the port of Malaga, Spain April 26, 2018. REUTERS/Jon Nazca TPX IMAGES OF THE DAY 

A migrant, part of a group intercepted aboard two dinghies off the coast in the Mediterranean Sea, rests after arriving on a rescue boat at the port of Malaga, Spain April 26, 2018. REUTERS/Jon Nazca 

A migrant, part of a group intercepted aboard two dinghies off the coast in the Mediterranean Sea, rests on a rescue boat upon arrival at the port of Malaga, Spain April 26, 2018. REUTERS/Jon Nazca 

A migrant, part of a group intercepted aboard two dinghies off the coast in the Mediterranean Sea, rests on a rescue boat upon arrival at the port of Malaga, Spain April 26, 2018. REUTERS/Jon Nazca 

Washed clothes of Afghan migrants are seen on rocks, put out to dry, near a bus terminal in Agri, eastern Turkey, April 11, 2018. Picture taken April 11, 2018. REUTERS/Umit Bektas 

The feet of Central American migrants, moving in a caravan through Mexico, are pictured during a travel in an open wagon of a freight train after stopping it on the rail line, in Guanajuato state, Mexico April 17, 2018. REUTERS/Edgard Garrido 

A Central American migrant, moving in a caravan through Mexico, adjusts his blanket as he travels in an open wagon of a freight train after stopping it on the rail line, in Michoacan state, Mexico April 17, 2018. REUTERS/Edgard Garrido 

Central American migrants, moving in a caravan through Mexico, eat next to the railway as they try and board a freight train, in Irapuato, in Guanajuato state, Mexico April 16, 2018. Picture taken April 16, 2018. REUTERS/Edgard Garrido