The Trump campaign is already fundraising off of President Trump's exit from Walter Reed Medical Center Monday night, urging supporters not to be, "afraid of Covid," which has killed over 200,000 Americans. 

The subject of a fundraising email sent Monday night said: "I'M BACK" -- even though his doctors said earlier in the day that he's not out of the woods yet.  

The email goes on to argue "under the Trump Administration, we have developed some really great drugs and knowledge," but since testing positive the president has received some of the best treatment in the world -- which most Americans don't have access to.   

"This is it...I need you to step up to the front lines during this critical time," the email urges supporters.

--ABC News' Will Steakin

Former Vice President Joe Biden slammed Trump's tweet telling Americans, "don't let (coronavirus) dominate your life."

Biden responded in an interview with Local 10 News in South Florida shortly before the president left Walter Reed for the White House.

"President's getting out, I saw a tweet he did, they showed me," Biden said. "They said, 'don't let COVID control your lives.' Tell that to the 205,000 families who lost somebody."

President Trump "is essentially asking to be rehired, and the number one job he's had to do in the eyes of Americans is manage this pandemic -- and his own workplace is a contagion," said ABC News Senior National Correspondent Terry Moran.

Marine One landed on the White House South Lawn at 6:53 p.m. Trump, again, did not stop and talk to reporters but made a dramatic return without speaking a word.

He, instead, walked up the steps of White House, faced the cameras and took off his mask -- in an apparent effort to project strength and flout public health protocols as he continues to battle COVID-19. Trump also gave a thumbs up and an extended salute to Marine One, before walking inside the residence. 

The president is returning to a White House plagued by COVID-19 as 18 people in Trump's orbit have reported testing positive since last week.

Multiple White House sources told ABC News there is "a full-blown freak-out" in the administration waiting to see who will be next to test positive -- with aides not trusting each other and some trying to find ways to avoid coming into work.

White House press secretary Kayleigh McEnany, who announced she tested positive for the coronavirus on Monday morning, was speaking with reporters Sunday evening-- without a mask on -- following an appearance on FOX News at the White House.

Despite her recent interactions with reporters, McEnany says in a statement that "no reporters, producers, or members of the press are listed as close contacts by the White House Medical Unit."

As McEnany approached reporters Sunday evening, she removed her mask before taking three questions.

McEnany also held a briefing with reporters indoors on Thursday, prior to the president’s trip to New Jersey -- she was one of four aides pulled from the Bedminster trip because of her exposure to Hope Hicks, who tested positive on Wednesday, but did not strictly quarantine. McEnany said she had tested negative that day.

And on Friday, she also spoke with reporters without wearing a mask -- she wore one as she approached reporters but then took it off before speaking with them.

There is no indication that McEnany has spent any time at Walter Reed since the president was transferred there Friday.

-ABC News' Jordyn Phelps and Ben Gittleson