Stephen Colbert Roasts Donald Trump's Budget With Simple Math

May 25, 2017

Earlier this week, news started circulating that President Trump’s proposed budget was based on a math error, a very large one, too. “It turns out that the entire budget is based on a $2 trillion math error,” said Stephen Colbert on Wednesday night’s episode of The Late Show. While theoretically the budget is meant to boost economic growth enough to pay for $2 trillion in spending within 10 years, critics say it contained an accounting error that adds up to a $2 trillion oversight.

Colbert had an idea about the source of the questionable computing. “There is a simple explanation for how this happened: Donald Trump is an idiot,” Colbert quipped, adding another possibility into the mix: “Or, he’s lying.”

While White House Budget Director Mick Mulvaney stands by the numbers in the budget, saying during a press briefing, that the double counting was done “on purpose” because “you don't want to make too many assumptions.”

Colbert was not impressed with the explanation, retorting: “You don't want to make assumptions because when you assume, you make an a-- out of you, Mick Mulvaney.”

Watch the full clip below.

All products and services featured are based solely on editorial selection. TIME may receive compensation for some links to products and services on this website.