A vast majority of registered voters think President Biden lacks the mental capacity for the presidency, according to a new CBS News poll conducted after the first presidential debate. 

In total, 72% of registered voters surveyed said have the "metal and cognitive health" needed to serve as president. In addition, 72% of respondents said Biden should not be running for re-election, which is an increase from 63% in February. 

Among Democratic registered voters, 45% said Biden should step aside and not continue his presidential campaign while 55% said he should keep running.