In a brief aside during a Monday night monologue about White House press secretary Sean Spicer’s future in the Trump administration, Late Show host Stephen Colbert offered a blunt statement aimed directly at Donald Trump.

“Donald Trump, if you’re watching, first of all, you’re a bad president,” Colbert said to cheers from his audience. “Please resign.”

Though network late-night talk shows have traditionally tried to court the largest audience possible by avoiding firm stances on controversial topics likely to alienate some potential viewers, Colbert has become increasingly forthright in his criticism of Trump. The latest jab came on the heels of the revelation that Trump shared classified information with Russian officials in a closed-door meeting one day after he fired FBI director James Comey in the midst of the bureau’s investigation of Russian interference in the 2016 presidential election.