A volunteer opens a mailed-in ballot letter during the German general elections, in Munich, Germany, September 26, 2021. REUTERS/Michaela Rehle

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

A volunteer attempts to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson TPX IMAGES OF THE DAY

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

Volunteers attempt to evacuate horses to safety in California Hot Springs as the Windy Fire expands in Sequoia National Forest, California, U.S., September 25, 2021. REUTERS/David Swanson

A Shi'ite pilgrim prays at a tent set up by volunteers to provide a place for pilgrims to rest as they walk to the holy city of Kerbala, ahead of the holy Shi'ite ritual of Arbaeen, in Najaf, Iraq September 24, 2021. Picture taken September 24, 2021. REUTERS/Alaa Al-Marjani

Volunteers classify shoes donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

Volunteers classify goods donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

Volunteers classify cloth donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

Volunteers classify cloth donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

Volunteers classify cloth donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

Volunteers classify cloth donated to assist people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

A volunteer classifies cloth donated to people who lost their homes and belongings due to the volcano eruption in the Cumbre Vieja national park, on the Canary Island of La Palma, at Severo Rodriguez sports centre in Los Llanos de Aridane, Spain September 23, 2021. REUTERS/Jon Nazca

A volunteer hands out baby diapers as migrants seeking asylum in the U.S. line up to board a bus to Houston from Val Verde Border Humanitarian Coalition after being released from U.S. Customs and Border Protection, in Del Rio, Texas, U.S., September 23, 2021. REUTERS/Marco Bello

A Mexican volunteer grills food for migrants in a makeshift camp near the border with the U.S., in Ciudad Acuna, Mexico September 22, 2021. REUTERS/Daniel Becerril

A volunteer offers food to Antonio Peres, 77, and Rosa Contreras, 72, who were evacuated from their home, while the volcano erupts in the background, at the Los Acero stadium in Los Llanos de Aridane on the Canary Island of La Palma, Spain September 20, 2021. REUTERS/Nacho Doce

A volunteer offers food to Antonio Peres, 77, and Rosa Contreras, 72, who were evacuated from their home, while the volcano erupts in the background, at the Los Acero stadium in Los Llanos de Aridane, on the Canary Island of La Palma, Spain September 20, 2021. REUTERS/Nacho Doce

Buddhist monks and volunteers from Wat Siriphong Thamma Nimit temple wearing Personal Protective Equipment (PPE) ride a golf cart pulling a trailer truck loaded with bags of fresh vegetables to donating food and other necessities to vulnerable people whose livelihoods have been hit hard by the coronavirus disease (COVID-19) pandemic on the outskirts of Bangkok, Thailand, September 18, 2021. Picture taken September 18, 2021. REUTERS/Jiraporn Kuhakan

A member of local election committee speaks to volunteers as he prepares a polling station for parliamentary elections in the village of Ivolginsk, Buryatia republic, Russia September 16, 2021. RUETERS/Maxim Shemetov

A volunteer assembles a voting booth at a polling station ahead of parliamentary elections in the village of Ivolginsk, Buryatia republic, Russia September 16, 2021. RUETERS/Maxim Shemetov

A member of local election committee and a volunteer carry a ballot box at a polling station ahead of parliamentary elections in the village of Ivolginsk, Buryatia republic, Russia September 16, 2021. RUETERS/Maxim Shemetov

Volunteers of the "Yes" committee for the legalization of abortion, pose for a photograph ahead of the referendum on September 26th in San Marino, one of the smallest countries in Europe, on September 15, 2021, Picture taken September 15, 2021. REUTERS/Jennifer Lorenzini

Volunteers prepare a site to build a new bridge in an attempt to ease crossing between villages and reduce accidents, in Jendouba, Tunisia, September 15, 2021. Picture taken September 15, 2021. REUTERS/Jihed Abidellaoui

A view shows on one of the bridges that was built by volunteers in an attempt to ease crossing between villages and reduce accidents, in Jendouba, Tunisia, September 15, 2021. Picture taken September 15, 2021. REUTERS/Jihed Abidellaoui

Karim Arfa, a 36-year-old civil society activist, stands on one of the bridges that he built with other volunteers in an attempt to ease crossing between villages and reduce accidents, in Jendouba, Tunisia, September 15, 2021. Picture taken September 15, 2021. REUTERS/Jihed Abidellaoui

Zohra Othmani, 75, speaks during an interview with Reuters, as she stands on one of the bridges that was built by volunteers in an attempt to ease crossing between villages and reduce accidents, in Jendouba, Tunisia, September 15, 2021. Picture taken September 15, 2021. REUTERS/Jihed Abidellaoui

Actor Alan Ruck, known for his acting roles in the film "Ferris Bueller's Day Off" and the television series "Succession," smiles from behind the wheel of a Biden presidential motorcade van after serving as a volunteer driver for photographers, reporters and television crews during U.S. President Joe Biden's visit to Long Beach, California, U.S. September 14, 2021. Photo taken September 14, 2021. REUTERS/Steve Holland

U.S. first lady Jill Biden brings beer as she and President Joe Biden arrive to greet people at the Shanksville volunteer fire station, stopping at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks to reporters before paying his respects at a 9/11 memorial outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden pays his respects at a 9/11 memorial outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden hugs a woman while visiting firefighters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

United Airlines flight attendants who fly the Flight 93 route watch and listen as U.S. President Joe Biden talks to reporters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden greets firefighters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden pays his respects at a 9/11 memorial outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden pays his respects at a 9/11 memorial outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden talks with reporters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden talks with reporters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall, after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed, on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden talks with reporters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden talks with a woman while visiting firefighters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden hugs a woman while visiting firefighters outside the Shanksville volunteer fire station, as he and first lady Jill Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly visited the firehouse over the years since 2001. REUTERS/Jonathan Ernst

U.S. first lady Jill Biden hands out six packs of beers to firefighters outside the Shanksville volunteer fire station, as she and President Joe Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. Biden has repeatedly taken the firefighters at the station beers and food over the years since 2001. REUTERS/Jonathan Ernst

U.S. President Joe Biden and first lady Jill Biden greet firefighters outside the Shanksville volunteer fire station, as Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden and first lady Jill Biden greet firefighters outside the Shanksville volunteer fire station, as Biden stopped at the fire hall after visiting the nearby site where the hijacked United Airlines Flight 93 plane crashed on the 20th anniversary of the September 11, 2001 attacks, in Shanksville, Pennsylvania, U.S., September 11, 2021. REUTERS/Jonathan Ernst

Volunteers stand next to a voting registration booth on the sidelines of the 9/11 Heroes Run to commemorate the 20th anniversary of the September 11 attacks, in Houston, Texas, U.S., September 11, 2021. REUTERS/Adrees Latif

Volunteer Vera Smith alerts a line of traffic that supplies had run out during an event put on by New Orleans City Council President Helena Moreno and Vice President Donna M. Glapion who teamed up with community partners to distribute cell phones, ice, essential items and hot meals over a week after Hurricane Ida hit Louisiana, at Carver High School in New Orleans, Louisiana, U.S., September 7, 2021. REUTERS/Kathleen Flynn

Volunteers distribute food and water during a drive through event put on by New Orleans City Council President Helena Moreno and Vice President Donna M. Glapion as they teamed up with community partners to distribute cell phones, ice, essential items and hot meals over a week after Hurricane Ida hit Louisiana, at Carver High School in New Orleans, Louisiana, U.S., September 7, 2021. REUTERS/Kathleen Flynn

Volunteer William Holmes offers gallons of water during a distribution of supply event put on by New Orleans City Council President Helena Moreno and Vice President Donna M. Glapion, who teamed up with community partners to distribute cell phones, ice, essential items and hot meals over a week after Hurricane Ida hit Louisiana, at Carver High School in New Orleans, Louisiana, U.S., September 7, 2021. REUTERS/Kathleen Flynn

Volunteer Vera Smith directs traffic during an event to distribute supplies organised by New Orleans City Council President Helena Moreno and Vice President Donna M. Glapion, who teamed up with community partners to distribute cell phones, ice, essential items and hot meals over a week after Hurricane Ida hit Louisiana, at Carver High School in New Orleans, Louisiana, U.S., September 7, 2021. REUTERS/Kathleen Flynn

Volunteers from Lebanese Red Cross carry trash bags as they collect garbage in Beirut, Lebanon September 5, 2021. Picture taken September 5, 2021. REUTERS/Issam Abdallah

Volunteers from Lebanese Red Cross carry trash bags as they collect garbage in Beirut, Lebanon September 5, 2021. Picture taken September 5, 2021. REUTERS/Issam Abdallah

Tokyo 2020 Paralympic Games - The Tokyo 2020 Paralympic Games Closing Ceremony - Olympic Stadium, Tokyo, Japan - September 5, 2021. Volunteers wave onstage during the closing ceremony. REUTERS/Kim Kyung-Hoon

Tokyo 2020 Paralympic Games - The Tokyo 2020 Paralympic Games Closing Ceremony - Olympic Stadium, Tokyo, Japan - September 5, 2021. Volunteers hold national flags during the parade at the closing ceremony REUTERS/Kim Kyung-Hoon

Tokyo 2020 Paralympic Games - The Tokyo 2020 Paralympic Games Closing Ceremony - Olympic Stadium, Tokyo, Japan - September 5, 2021. Volunteers hold national flags during the parade at the closing ceremony REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY

German Chancellor Angela Merkel, right, poses for a photo with volunteers besides Malu Dreyer, Prime Minister of Rhineland-Palatinate, left, during their visit to the flood-damaged Altenahr, Germany, September 3, 2021. Markus Schreiber/Pool via REUTERS

Employees and volunteers help clean up at a gym after floodwaters caused by the remnants of Tropical Storm Ida receded in Conshohocken, Pennsylvania, U.S., September 2, 2021. REUTERS/Bastiaan Slabbers TPX IMAGES OF THE DAY

Local volunteers Izzi Lucas, (L) and Claudio Venancio of The New Orleans Resilience Corps give food prepared by other volunteers to people for free as power continues to be out in most of the city after hurricane Ida ripped through the state in New Orleans, Louisiana, U.S., September 1, 2021. Several local relief groups, community members and restaurant owners got together and began donating food and cooking it. Michael DiSimone CEO of the Link Restaurant Group said they made approximately 2,000 meals for the community that day. REUTERS/Leah Millis

Local volunteers Izzi Lucas, (L) and Claudio Venancio of The New Orleans Resilience Corps give food prepared by other volunteers to people for free as power continues to be out in most of the city after hurricane Ida ripped through the state in New Orleans, Louisiana, U.S., September 1, 2021. Several local relief groups, community members and restaurant owners got together and began donating food and cooking it. Michael DiSimone CEO of the Link Restaurant Group said they made approximately 2,000 meals for the community that day. REUTERS/Leah Millis