US President Donald Trump said he will travel to a military hospital for a "semi-annual physical," describing it as a routine exam.

"I think I'm in great shape, but I'll let you know," Trump said from the Oval Office ahead of a meeting with the Finnish president.

"Physically, I feel very good, mentally I feel very good."

Earlier, the White House announced Trump would go to the Walter Reed National Military Medical Centre in Maryland for what it called a "yearly check up."

That initial description prompted confusion, since Trump had received an "annual" exam just six months ago.

Trump's doctor at that time deemed him "fully fit" to execute his duties, writing in an April memo that he was in "excellent health" — and citing his frequent golf outings as evidence of his wellbeing.

Since t

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