When Biden says something dumb, it's because he's dumb.' When I say something that you might think is a gaffe, it's on purpose it's not a gaffe. 'I hope it's Biden,' he told a group of television anchors before his State of the Union address. President Trump said he's eager to battle Biden for the White House. He turned his confession into a dig at Donald Trump-'But my God, what a wonderful thing compared to a guy who can't tell the truth'-but now the former vice president has entered the 2020 presidential race, he might regret some of his stumbles. Joe Biden admits it: 'I am a gaffe machine,' he said in December 2018.