This is what you get when you elect a hardened criminal chief executive.

The Manhattan district attorney on Tuesday sued Representative Jim Jordan of Ohio in an extraordinary step intended to keep congressional Republicans from interfering in the office’s criminal case against former President Donald J. Trump.

The 50-page suit, filed in federal court in the Southern District of New York, accuses Mr. Jordan of a “brazen and unconstitutional attack” on the prosecution of Mr. Trump and a “transparent campaign to intimidate and attack” the district attorney, Alvin L. Bragg. Mr. Bragg last week unveiled 34 felony charges against Mr. Trump that stem from the former president’s attempts to cover up a potential sex scandal during and after the 2016 presidential campaign.

Lawyers for Mr. Bragg are seeking to bar Mr. Jordan and his congressional allies from enforcing a subpoena sent to Mark F. Pomerantz, who was once a leader of the district attorney’s Trump investigation and who later wrote a book about that experience. Mr. Pomerantz resigned early last year after Mr. Bragg, just weeks into his first term in office, decided not to seek an indictment of Trump at that time.

Mr. Bragg’s lawyers, including Theodore J. Boutrous Jr. of the law firm Gibson Dunn and Leslie B. Dubeck, the general counsel in the district attorney’s office, also intend to prevent any other such subpoenas, the lawsuit says. Mr. Jordan has left open the possibility of subpoenaing Mr. Bragg.

Jordan shouldn’t be doing any of this. It’s corrupt and authoritarian.

“Rather than allowing the criminal process to proceed in the ordinary course, Chairman Jordan and the committee are participating in a campaign of intimidation, retaliation and obstruction,” the suit said, adding that the district attorney’s office had received more than 1,000 calls and emails from Mr. Trump’s supporters — many of them “threatening and racially charged” — since the former president predicted his own arrest last month.

Mr. Jordan responded in a statement on Twitter.

“First, they indict a president for no crime,” he wrote. “Then, they sue to block congressional oversight when we ask questions about the federal funds they say they used to do it.”

Trump is not a president. Jordan of course does not know the indictment is “for no crime.” Micromanagement of an urban DA is not Congress’s job.