President Donald Trump is again putting the squeeze on freedom of the press.

On Wednesday, he targeted the common practice of anonymous and off-the- record quotes in media stories, threatening to sue writers and reporters who use them.

“As a President who is being given credit for having the Best Opening Month of any President in history, quite naturally, here come the Fake books and stories with the so-called ‘anonymous,’ or ‘off the record,’ quotes,” he wrote on Truth Social. “At some point I am going to sue some of these dishonest authors and book publishers, or even media in general, to find out whether or not these ‘anonymous sources’ even exist, which they largely do not.”

Trump called the journalistic practice used to shield the identities of vulnerable sources “made up, defamatory fiction.”

“A big price should be paid for this blatant dishonesty,” he continued. “I’ll do it as a service to our Country. Who knows, maybe we will create some NICE NEW LAW!!!”

Trump may have been responding to Michael Wolff’s new tell-all, “All Or Nothing: How Trump Recaptured America,” in which an unnamed confidant revealed that Melania Trump “fucking hates” her husband.

Trump has taken several actions of late to undermine the Fourth Estate.

He banned The Associated Press from presidential events for refusing to comply with his edict to call the Gulf of Mexico the “Gulf of America.”

Trump and his administration later determined they would hand-select the reporters in the White House press pool, stripping the task from the White House Correspondents’ Association. That decision left a HuffPost reporter excluded from the pool on Wednesday.

Previously, Trump sued ABC News over purported defamatory language, CBS’s “60 Minutes” over perceived editing bias, and the Des Moines Register over its polling before the election.

Trump frequently issues invectives against mainstream media, which he calls “fake news.”

While relying on anonymous quotes is often seen as a last resort in journalism, it is a critical tool. HuffPost’s style guide urges reporters to persuade all interview subjects to go on the record, but notes that if keeping a source nameless is the only way to obtain “relevant or vital information,” it is permissible.