Article continues below advertisementIn his own mocking way, Stephen Colbert has expressed concerns about Donald Trump's health.During the Tuesday night, October 28, episode of The Late Show With Stephen Colbert, the famed comedian questioned Trump's cognitive abilities following the president of the United States' recent visit to Walter Reed National Military Medical Center - where he claimed to score "perfect" results on an MRI exam.While White House Press Secretary Karoline Leavitt insisted Trump's MRI was part of a routine health check-up, Colbert disagreed.