Michael Cohen is a fraud of a lawyer who works exclusively for President Trump, federal prosecutors charged Friday.

“Cohen has told at least one witness that he has only [one] client — President Trump,” the lawyers wrote in court documents, challenging Cohen’s claims that records seized in raids on his home and office Monday should be protected by attorney-client privilege.

And he’s barely doing any “legal work” for Trump, either, they claim.

“[Reviews of the records] indicate that Cohen is in fact performing little to no legal work, and that zero ­e-mails were exchanged with President Trump,” according to the brief, filed in Manhattan federal court.

In fact, the criminal investigation into Cohen isn’t about his work as a lawyer, “but rather relate[s] to Cohen’s own business dealings,” the feds argued.

The claims came after Cohen’s own attorney challenged the seizure of the documents, which include records relating to Cohen’s payments to porn actress Stormy Daniels.

But when the judge demanded that Cohen’s lawyers provide some proof that Cohen has any other clients beyond the commander in chief, they twice came back empty-handed.

“What I need to know is whether you have a basis as a representative of the court to know whether there are ‘thousands and thousands’ of privileged documents,” said a testy Judge Kimba Wood.

“It’s an estimate,” replied Cohen’s lawyer, Todd Harrison. “That is my best understanding. I don’t know the exact number, your honor. It might be less than a thousand.”

Wood ultimately demanded that Cohen’s lawyers return Monday with the list of other clients — and Cohen.