After quite a bit of speculation, former Vice-President Joe Biden launched his 2020 presidential run over the weekend.
It got the attention of Stephen Colbert, who spent some time talking about Biden's campaign video, which talked about Trump's reaction to Charlottesville -- something that the president had to explain again.
"Trump's already worried about Joe Biden," Colbert said. "And the proof of that is that this ad did something none of the other Democrats have been able to do, and that's put Trump on the defensive."
