Bulgarian Navy minehunter BGS Tsibar sails in the Bosphorus towards the Black Sea, in Istanbul, Turkey October 29, 2020, after participating in the Turkish Navy-led multinational Mine Warfare Exercise Nusret-2020. REUTERS/Murad Sezer

Hellenic Navy general support ship Aliakmon (A470), flagship of the Standing NATO Mine Countermeasures Group 2 (SNMCMG2), sails in the Bosphorus towards the Black Sea in Istanbul, Turkey October 29, 2020, after participating in the Turkish Navy-led multinational Mine Warfare Exercise Nusret-2020. REUTERS/Murad Sezer

A Marine of the Chilean Navy stands guard as people wearing protective masks wait to vote during a referendum on a new Chilean constitution, in Valparaiso, Chile October 25, 2020. REUTERS/Rodrigo Garrido

A Marine of the Chilean Navy stands guard as people wearing protective masks wait to vote during a referendum on a new Chilean constitution, in Valparaiso, Chile October 25, 2020. REUTERS/Rodrigo Garrido

A man holds a fishing rod in front of a Latvian Navy ship illuminated with colored lights during the "Illuminated Liepaja" light festival, which was cancelled in March due to the coronavirus disease (COVID-19) pandemic and postponed to the end of October, in Liepaja, Latvia October 24, 2020. REUTERS/Ints Kalnins

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson speaks with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

Britain's Prime Minister Boris Johnson poses with Flt. Lt. Ollie Smith from RAF, Able Seaman Laura Chisholm from Royal Navy, SSgt Ilaitia Vuki from British Army and Director of Fundraising Claire Rowcliffe during a meeting with fundraisers for the Royal British Legion outside Downing Street in London, Britain, October 23, 2020. REUTERS/Simon Dawson

People stand on the deck of a retired Royal Australian Navy ship at the Australian National Maritime Museum in Sydney, Australia, October 21, 2020. REUTERS/Loren Elliott

People stand on the deck of a retired Royal Australian Navy ship at the Australian National Maritime Museum in Sydney, Australia, October 21, 2020. REUTERS/Loren Elliott

Jim Sakasits poses for a portrait in his Nazareth Army Navy Store in the Northampton County borough of Nazareth, Pennsylvania, U.S., October 2, 2020. Sakasits, who opened the store in 1972, is a self-described conservative and is sticking with Trump in 2020 despite disliking the president's personality and preferring Joe Biden as a person. "I don't vote on personality," he said. Photo taken October 2, 2020. REUTERS/Brian Snyder

A Marine of the Chilean Navy points his shotgun at demonstrators during a protest against Chile's government, on the one-year-anniversary of the protests and riots in 2019, in Quilpue, Chile October 18, 2020. REUTERS/Rodrigo Garrido

Marines of the Chilean Navy stand guard as a group of demonstrators gather ahead of the one-year anniversary of mass protests that saw thousands of Chileans take to the streets, in Valparaiso, Chile October 16, 2020. REUTERS/Rodrigo Garrido

The sun sets as the Turkish Navy's training ship TCG Cezayirli Hasan Pasa (A-579) sets sail in Marmara Sea in Istanbul, Turkey October 12, 2020. REUTERS/Murad Sezer

U.S. Navy Commander Dr. Sean Conley, the White House physician, looks at a folder during a briefing about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, arrives with other doctors to speak to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

White House Chief of Staff Mark Meadows rubs his head as U.S. Navy Commander Dr. Sean Conley, the White House physician, speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott TPX IMAGES OF THE DAY

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

White House Chief of Staff Mark Meadows gestures as U.S. Navy Commander Dr. Sean Conley, the White House physician, speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott TPX IMAGES OF THE DAY

U.S. Navy Commander Dr. Sean Conley, the White House physician, speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, arrives with other doctors to speak to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, is flanked by other doctors as he speaks to the media about U.S. President Donald Trump's health after the president was hospitalized for the coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 4, 2020. REUTERS/Erin Scott

U.S. Navy Commander Dr. Sean Conley, the White House physician, joined by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

White House Chief of Staff Mark Meadows listens as U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, flanked by other doctors, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno TPX IMAGES OF THE DAY

U.S. Navy Commander Dr. Sean Conley, the White House physician, removes his mask to speak with reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, joined by a team of doctors, comes out to speak with reporters about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S. Saturday, October 3, 2020. REUTERS/Ken Cedeno

White House Chief of Staff Mark Meadows pats U.S. Navy Commander Dr. Sean Conley, the White House physician, on the back following a media briefing about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno ?

White House Chief of Staff Mark Meadows listens as U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

White House Chief of Staff Mark Meadows listens as U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

White House Chief of Staff Mark Meadows listens as U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

U.S. Navy Commander Dr. Sean Conley, the White House physician, talks to the media about U.S. President Donald Trump's health after the president was hospitalized for coronavirus disease (COVID-19) treatment, at Walter Reed National Military Medical Center, in Bethesda, Maryland, U.S., October 3, 2020. REUTERS/Ken Cedeno

A whale is seen near a sailboat near the Faslane nuclear submarine base in Gare Loch as rescuers are racing to herd a group of whales out of a Scottish loch ahead of major military exercises in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne

Men look at a camera screen near the Faslane nuclear submarine base in Gare Loch as rescuers are racing to herd a group of whales out of a Scottish loch ahead of major military exercises in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne

A whale is seen near the Faslane nuclear submarine base in Gare Loch as rescuers are racing to herd a group of whales out of a Scottish loch ahead of major military exercises in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne

Whales are seen near the Faslane nuclear submarine base in Gare Loch as rescuers are racing to herd a group of whales out of a Scottish loch ahead of major military exercises in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne

A whale is seen near the Faslane nuclear submarine base in Gare Loch as rescuers are racing to herd a group of whales out of a Scottish loch ahead of major military exercises in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne

A person gestures as a navy vessel approaches Gare Loch, in Scotland, Britain October 2, 2020. REUTERS/Russell Cheyne