U.S. President Donald Trump arrives at Walter Reed National Military Medical Center by helicopter after the White House announced that he "will be working from the presidential offices at Walter Reed for the next few days" after testing positive for the coronavirus disease (COVID-19), in Bethesda, Maryland, U.S., October 2, 2020.

President Trump's COVID-19 symptoms are 'very concerning,' with next 48 hours 'critical' to recovery

"The president’s vitals over the last 24 hours were very concerning and the next 48 hours will be critical in terms of his care."

President Trump

President Trump and the First Lady have tested positive for COVID-19

"We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!" the president said in a tweet early on Friday morning.

President Donald Trump walks to Air Force One from the Marine One helicopter as he departs on a day trip to Arizona and a visit to the U.S.-Mexico border, leaving Washington from Joint Base Andrews, Maryland, U.S., June 23, 2020.

What to know about Trump's promise to end the 'endless wars'

"There's still a lot more that we need to talk about what it means to actually end the war."

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WATCH: President Trump awards Sgt. Maj. Thomas P. Payne with Medal of Honor

Sgt. Maj. Payne is receiving the Medal of Honor for his "extraordinary heroism and selfless actions" during a hostage rescue in 2015.

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Removal of POW/MIA flag from White House sparks anger

A decision by the Trump administration earlier this year to move the flag honoring missing war veterans from a prominent position atop the White House to a less visible spot on the South Lawn has angered some veterans and lawmakers, who see it as disrespectful and potentially illegal