(CNN) During the course of the 2020 campaign, Donald Trump repeatedly tried to make Joe Biden's mental state a major issue. Forty-one percent of voters in the exit poll said that only Biden had the mental and physical health to serve as president. The same number -- 41% -- said that only Trump had the mental and physical stamina to do the job. Despite the issue being, largely, moot during the campaign, Republicans continue to keep questions about Biden's mental health front and center. (Of course, Democrats spent much of Trump's term calling for the invocation of the 25th Amendment.

Source: CNN August 19, 2021 22:30 UTC