Donald Trump referred to himself as a king on social media this week, and on Thursday night, Stephen Colbert was quick to put him in his place. According to the CBS host, there's only one true king in America — and it's one who's openly mocked Trump before.

President Trump referring to himself as a king “is the thing presidents are not supposed to do,” Colbert said on Thursday.

On Thursday’s Late Show, Colbert spoke about the recent implementation of congestion pricing in New York City to help reduce traffic and emissions. He pointed out how the concept seems to be working, as traffic has diminished and foot traffic in Manhattan has increased, with Broadway shows selling out and local businesses benefiting.