GOP presidential front-runner Donald Trump seized the opportunity to launch a new series of insults against Fox News host Megyn Kelly when she returned from vacation to host Monday night’s “The Kelly File.” The Washington Post reports that Trump couldn’t resist watching Kelly’s show, and then took to Twitter to offer a critique.

Kelly hasn’t had much to say in the one-sided feud, the report notes, but Trump has continued his verbal assault since taking offense at her questioning of him during the first GOP debate almost a month ago.

Trump got the ball rolling Monday night with a tweet that read: “.@megynkelly must have had a terrible vacation, she is really off her game. Was afraid to confront Dr. Cornel West. No clue on immigration!”

He followed up a few minutes later with this one: “I liked The Kelly File much better without @megynkelly. Perhaps she could take another eleven day unscheduled vacation!”

Trump then took to retweeting messages from users who appeared to agree with him. Among them: “@bigpaulfla: @realDonaldTrump She has come back looking like Nancy Grace.”

And this retweet: “@mstanish53: @realDonaldTrump @megynkelly The bimbo back in town . I hope not for long .”