Medical experts are questioning Donald Trump’s decision to greet supporters in a drive-past outside the hospital where he is being treated for Covid-19.
There are concerns the US president, who wore a mask, may have endangered Secret Service staff inside the car.
White House spokesperson Judd Deere said the trip on Sunday had been “cleared by the medical team as safe”.
Questions remain over the seriousness of Mr Trump’s illness after conflicting statements over the weekend.
The president has been in hospital since Friday, after he announced hours earlier he had tested positive for the virus.
Covid-19 has infected nearly 7.4 million and killed nearly 210,000 people across the US, according to Johns Hopkins University.
President Trump’s diagnosis has upended his election campaign, as he faces Democratic challenger Joe Biden on 3 November.
A growing number of people around the president, including his wife Melania Trump, senior aides and Republican senators, have tested positive with the virus.