Alarmed by Donald J. Trump’s record of filing lawsuits to punish and silence his critics, a committee of media lawyers at the American Bar Association commissioned a report on Mr. Trump’s litigation history. The report concluded that Mr. Trump was a “libel bully” who had filed many meritless suits attacking his opponents and had never won in court.

But the bar association refused to publish the report, citing “the risk of the A.B.A. being sued by Mr. Trump.”

David J. Bodney, a former chairman of the media-law committee, said he was baffled by the bar association’s interference in the committee’s journal.

“It is more than a little ironic,” he said, “that a publication dedicated to the exploration of First Amendment issues is subjected to censorship when it seeks to publish an article about threats to free speech.”