White House physician Sean Conley has cautioned that President Trump "may not entirely be out of the woods yet".

Speaking on Monday afternoon, he said the medical team agreed that the president's status and progress "support his safe return home, where he'll be surrounded by world-class medical care 24/7".

Dr Conley refused to answer questions about when Mr Trump last received a negative test or to go into the specifics of his treatment. He would not offer details regarding the president's scans to check for pneumonia, citing patient protection laws.

The White House physician did confirm Mr Trump is still on the steroid dexamethasone and has received three doses of antiviral drug remdesivir. He received another before discharge and was due a fifth at the White House.