"We are going to take a strong look at our country's libel laws so that when somebody says something that is false and defamatory about someone, that person will have meaningful recourse in our courts", Trump told reporters Wednesday.
"The president's physical exam today at Walter Reed National Military Medical Center went exceptionally well", Dr. Ronnie Jackson, the president's physician, said in a statement.
Trump himself has pushed back hard against any suggestion that he's mentally unfit, this week declaring himself "a very stable genius".
Trump takes Crestor for his cholesterol, a low-dose aspirin for heart attack prevention, Propecia to treat male-pattern baldness and antibiotics for rosacea. He also provided care for President Barack Obama and became a White House physician in 2006.
Reuters that Trump's comments came in response to the Wolff's recently-released Fire and Fury, which includes several explosive claims about the president, including that White House staffers believe he behaves like a child.
Trump was 70 when he took office on January 20, 2017, making him the oldest person ever elected to the nation's highest office.
Unlike previous presidents, Trump does not run or cycle, preferring instead to get his exercise on the golf course.
Obama played basketball, lifted weights, worked out on an elliptical machine or treadmill and played golf. He reportedly downs 12 Diet Cokes a day.
Dr Jackson was deployed in the Iraq War during the Bush administration as Emergency Medicine Physician in the Surgical Shock Trauma Platoon in Taqaddum in Iraq.
Jackson, a rear admiral in the Navy, holds the title of physician to the president.
However, rumours of possible 2020 bids for the White House continue.
Deontay Wilder to defend his title against unbeaten contender Luis Ortiz
No boxer has simultaneously held the WBC, IBF, WBA and WBO world heavyweight belts, and Wilder is a future target for Joshua. I blessed you with the opportunity and you messed it up".