US President Donald Trump is in "excellent cognitive and physical health", says his White House physician.

In the first annual physical of his second presidential term at a Washington DC-area hospital, Trump was also found to have "scaring on the right ear from a gunshot wound", after an assassination attempt last July.

"President Trump remains in excellent health, exhibiting robust cardiac, pulmonary, neurological, and general physical function," his doctor, Captain Sean Barbabella, said in a memo.

At 78, Trump was the oldest president to take office in January, though his predecessor, Joe Biden, was older at 82 by the time he left