President Joe Biden waves as he walks to board Marine One on the South Lawn of the White House in Washington, on his way to his Rehoboth Beach, Del., home after his most recent COVID-19 isolation, Sunday, Aug. 7, 2022.Manuel Balce Ceneta/AP President Biden left the White House for the first time in weeks since testing positive for COVID-19. Biden first tested positive on July 21, then tested negative before testing positive again on July 30. On Sunday, Biden departed for Rehoboth Beach, Delaware, where he will reunite with Jill Biden. President Joe Biden on Sunday left the White House for the first time in weeks since he tested positive for COVID-19 in July.