“The Late Show” host Stephen Colbert on Thursday asked Chris Krebs, the fired former chief of U.S. cybersecurity, to fact-check President Donald Trump’s latest round of disinformation about fraud in the 2020 election.

And, one by one, Krebs debunked or clarified the false claims the president made in a widely criticized 46-minute rant on Facebook ― from votes being counted in foreign countries to being changed from Trump to President-elect Joe Biden. Trump ousted Krebs, a lifelong Republican, last month for publicly contradicting his baseless claims of mass voting irregularities.

Check out the video here: