"I sometimes forget that part of the mental disorder of leftism is an inability to understand sarcasm," he wrote on X on Monday.

Biden’s office disclosed his prostate cancer diagnosis over the weekend, saying it has already spread to his bones.

Jake Tapper and Alex Thompson's book has already generated a national debate about whether the White House deceived the public about the president's cognitive state and how Biden's late exit from the race undermined the Democratic Party's chances of stopping Trump.