Roger J. Stone Jr., an ally of President Trump and a self-proclaimed political “dirty trickster,” has been kicked off Twitter.

In a series of tweets on Friday, Mr. Stone insulted several CNN news anchors and contributors. The messages appeared to be in response to reports that a federal grand jury had approved charges in the continuing investigation into the Trump campaign’s possible connections to Russia.

Mr. Stone’s posts were littered with expletives. He said Don Lemon, the host of “CNN Tonight,” “must be confronted, humiliated, mocked and punished,” adding that he was a “buffoon.”

He said Bill Kristol, a conservative pundit and a former columnist for The New York Times, was “packing on the pounds,” and used the hashtag #porky.