Donald Trump is in "excellent overall health," his physician said Friday after the 79-year-old -- the oldest elected president in US history -- underwent his second medical checkup of the year.

Trump saw physicians at Walter Reed military hospital on the outskirts of the capital Washington earlier in the day.

He gave reporters the thumbs-up on his return to the White House when they asked how the checkup had gone.

"President Trump continues to demonstrate excellent overall health," his doctor, Navy Captain Sean Barbabella, wrote in a letter released by the White House.

"His cardiac age -- a validated measure of cardiovascular vitality via ECG -- was found to be approximately 14 years younger than his chronological age. He continues to maintain a demanding daily schedule without restric

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