Jimmy Kimmel returned for the second episode of his late-night show after a temporary suspension, immediately targeting Donald Trump.
Kimmel explained he frequently discusses Mr Trump because he views him as a "bully" and dislikes such behaviour.
He directly addressed Mr Trump's claims about his suspension, including the suggestion it was due to poor ratings, and denied the White House was informed of a cancellation.
Mr Trump had celebrated Kimmel's brief absence, calling it "great news for America" and questioning why ABC reinstated him.
Kimmel's suspension followed controversial remarks about the suspected gunman in the Charlie Kirk shooting, leading to Nexstar Media Group ceasing to air his show and an FCC chair criticising his comments.