U.S. President Donald Trump walks to board Marine One as he departs for campaign travel to North Carolina and Florida from the South Lawn at the White House in Washington, U.S., September 24, 2020. REUTERS/Yuri Gripas

White House Chief of Staff Mark Meadows walks to Marine One with Deputy Chief of Staff Dan Scavino as they depart with U.S. President Donald Trump for campaign travel to Pennsylvania from the South Lawn at the White House in Washington, U.S., September 22, 2020. REUTERS/Carlos Barria

A visitor takes pictures of the Marine One helicopter carrying U.S. President Donald Trump, upon his departure from the White House in Washington on campaign travel to Fayetteville, North Carolina, U.S., September 19, 2020. REUTERS/Yuri Gripas

A U.S. Forest Service officer wears a patch on his uniform as he watches U.S. Marines and Sailors from the 7th Engineer Support Battalion train with professional wildland firefighters at Camp Pendleton, California, U.S., September 18, 2020. REUTERS/Mike Blake

Marine biologist Marina Benazic feeds Pinna nobilis, Mediterranean's largest clam on the verge of extinction, in Pula Aquarium, Pula, Croatia September 16, 2020. Picture taken September 16, 2020. REUTERS/Antonio Bronic

Marine biologist Marina Benazic prepares food for Pinna nobilis, Mediterranean's largest clam on the verge of extinction, in Pula Aquarium, Pula, Croatia September 16, 2020. Picture taken September 16, 2020. REUTERS/Antonio Bronic

Marine biologist Marina Benazic prepares food for Pinna nobilis, Mediterranean's largest clam on the verge of extinction, in Pula Aquarium, Pula, Croatia September 16, 2020. Picture taken September 16, 2020. REUTERS/Antonio Bronic

Marine biologist Marina Benazic inspects food for Pinna nobilis, Mediterranean's largest clam on the verge of extinction, in Pula Aquarium, Pula, Croatia September 16, 2020. Picture taken September 16, 2020. REUTERS/Antonio Bronic

Marine biologist Marina Benazic feeds Pinna nobilis, Mediterranean's largest clam on the verge of extinction, in Pula Aquarium, Pula, Croatia September 16, 2020. Picture taken September 16, 2020. REUTERS/Antonio Bronic

Staff members look on and wave as Marine One ascends ahead of U.S. President Trump's trip to Philadelphia, at the South Lawn of the White House in Washington, U.S., September 15, 2020. REUTERS/Tom Brenner

Staff members look on and wave as Marine One ascends ahead of U.S. President Trump's trip to Philadelphia, at the South Lawn of the White House in Washington, U.S., September 15, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump salutes as he steps from Marine One to board Air Force One upon his departure from Joint Base Andrews in Maryland, U.S., September 15, 2020. REUTERS/Kevin Lamarque

U.S. President Donald Trump and first lady Melania Trump, with White House Chief of Staff Mark Meadows, exit the Marine One helicopter to return to Washington after participating in a September 11 remembrance ceremony at the Flight 93 National Memorial, at Murtha Johnstown–Cambria County Airport in Johnstown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

U.S. President Donald Trump exits the Marine One helicopter to return to Washington after participating in a September 11 remembrance ceremony at the Flight 93 National Memorial, at Murtha Johnstown–Cambria County Airport in Johnstown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

U.S. President Donald Trump returns a salute as he disembarks from the Marine One presidential helicopter after attending the 19th annual September 11 observance at the Flight 93 National Memorial as he departs John Murtha Johnstown-Cambria County Airport in Johnstown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

U.S. President Donald Trump and first lady Melania Trump walk from the Marine One presidential helicopter after attending the 19th annual September 11 observance at the Flight 93 National Memorial as they depart John Murtha Johnstown-Cambria County Airport in Johnstown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

U.S. President Donald Trump and first lady Melania Trump disembark from Marine One after attending the 19th annual September 11 observance at the Flight 93 National Memorial as they depart John Murtha Johnstown-Cambria County Airport in Johnstown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

A U.S. Marine awaits the arrival U.S. President Donald Trump aboard the Marine One presidential helicopter prior to a ceremony at the Flight 93 National Memorial, remembering those killed when hijacked Flight 93 crashed into an open field on September 11, 2001, in Stoystown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

A U.S. Marine stands by as U.S. President Donald Trump arrives aboard the Marine One presidential helicopter prior to a ceremony at the Flight 93 National Memorial, remembering those killed when hijacked Flight 93 crashed into an open field on September 11, 2001, in Stoystown, Pennsylvania, September 11, 2020. REUTERS/Jonathan Ernst

Greece's Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus' President Nikos Anastasiadis, France's President Emmanuel Macron, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela pose after the closing of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greece's Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus' President Nikos Anastasiadis, France's President Emmanuel Macron, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela pose after the closing of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greece's Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus' President Nikos Anastasiadis, France's President Emmanuel Macron, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela pose after the closing of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greece's Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus' President Nikos Anastasiadis, France's President Emmanuel Macron, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela pose after the closing of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Italy's Prime Minister Giuseppe Conte and France's President Emmanuel Macron wear protective masks as they speak after the closing news conference of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Portugal's Prime Minister Antonio Costa and France's President Emmanuel Macron wear protective masks as they speak after the closing news conference of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Italy's Prime Minister Giuseppe Conte and France's President Emmanuel Macron speak after the closing news conference of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Italy's Prime Minister Giuseppe Conte and France's President Emmanuel Macron speak after the closing news conference of the seventh MED7 Mediterranean countries summit in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Cyprus President Nicos Anastasiades speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron speaks during the closing news conference of the seventh MED7 Mediterranean countries summit with Greek Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus President Nicos Anastasiades, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Portugal's Prime Minister Antonio Costa looks on during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron looks on during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron looks on during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron looks on during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron attends the closing news conference of the seventh MED7 Mediterranean countries summit with Greek Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus President Nicos Anastasiades, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Malta's Prime Minister Robert Abela speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Malta's Prime Minister Robert Abela speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron listens during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Malta's Prime Minister Robert Abela listens during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Cyprus President Nicos Anastasiades speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Cyprus President Nicos Anastasiades speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Italy's Prime Minister Giuseppe Conte speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Spain's Prime Minister Pedro Sanchez speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greek Prime Minister Kyriakos Mitsotakis speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greek Prime Minister Kyriakos Mitsotakis speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Portugal's Prime Minister Antonio Costa speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Spain's Prime Minister Pedro Sanchez speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Portugal's Prime Minister Antonio Costa speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Spain's Prime Minister Pedro Sanchez speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron speaks during the closing news conference of the seventh MED7 Mediterranean countries summit, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron speaks during the closing news conference of the seventh MED7 Mediterranean countries summit with Cyprus President Nicos Anastasiades and Portugal's Prime Minister Antonio Costa, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron speaks during the closing news conference of the seventh MED7 Mediterranean countries summit with Greek Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus President Nicos Anastasiades, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

France's President Emmanuel Macron speaks during the closing news conference of the seventh MED7 Mediterranean countries summit with Greek Prime Minister Kyriakos Mitsotakis, Italy's Prime Minister Giuseppe Conte, Cyprus President Nicos Anastasiades, Portugal's Prime Minister Antonio Costa, Spain's Prime Minister Pedro Sanchez, and Malta's Prime Minister Robert Abela, in Porticcio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

Greek Prime Minister Kyriakos Mitsotakis arrives for a meeting with French President Emmanuel Macron (not pictured) on the sidelines of the MED7 Mediterranean countries summit, in Porticcio, Corsica, France, September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron speaks with Greek Prime Minister Kyriakos Mitsotakis on the sidelines of the MED7 Mediterranean countries summit, in Porticcio, Corsica, France, September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron speaks with Greek Prime Minister Kyriakos Mitsotakis on the sidelines of the MED7 Mediterranean countries summit, in Porticcio, Corsica, France, September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron speaks with Greek Prime Minister Kyriakos Mitsotakis on the sidelines of the MED7 Mediterranean countries summit, in Porticcio, Corsica, France, September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron puts on his protective mask as he arrives for a news conference in Ajaccio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron puts on his protective mask as he arrives for a news conference in Ajaccio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron gives a news conference in Ajaccio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS

French President Emmanuel Macron gives a news conference in Ajaccio, on the Mediterranean Island of Corsica, France September 10, 2020. Ludovic Marin/Pool via REUTERS