Trump was filmed in a black vehicle, wearing a mask and saluting his supporters gathered near the hospital.
In a tweet posted the same day on Twitter, he previously announced that he would make a “little surprise”, greeting “great patriots from the street”.
The acting head of state appears in images wearing a mask, accompanied by two Secret Service agents, who in turn wear medical masks and coveralls.
“That should never have happened,” one of the members of the Secret Service, an elite police unit tasked with protecting U.S. presidents, told CNN.
“We are not sacrificial,” said the source, who denounced the president’s irresponsible attitude towards the two quarantined agents.
“He is completely irresponsible,” another Secret Service source told CNN.
“I looked at the information and it is ridiculous to say that the president is trying to kill his staff. It is not conventional, but we do our job “, said a third source.
Donald Trump’s departure has also been heavily criticized in the scientific community.
“Every person present in the vehicle during this completely unnecessary presidential outing must be quarantined for 14 days. They can get sick. I can die. For political theater. Commissioned by Trump to endanger their lives with this theater. It’s crazy, “said James Phillips of George Washington University School of Medicine on Twitter.
Walking outside Walter Reed, the president is seriously endangering his Secret Service agents. That is the height of irresponsibility, “a professor of medicine and surgery at George Washington University, Jonathan Reiner, denounced on Twitter.
The presidency emphasized that “appropriate” precautionary measures had been taken to protect the president and his entourage, consisting of “protective equipment”.
“The exit was validated by the medical team as safe,” said a presidential spokesman, Judd Deere.
Donald Trump’s medical team announced on Sunday, after spending two nights in hospital, that the US president’s health was “improving” and that a return to the White House “since Monday” could be considered.
The White House announced that the decision on a possible discharge of the American president from the hospital would be taken on Monday, “during the day”.