President Trump called Attorney General Jeff Sessions a “traitor” and a “dumb Southerner” during a White House meeting, according to the explosive new book “Fear” by Bob Woodward.

Trump, in a conversation with disgraced White House secretary Rob Porter, spoke in an exaggerated Southern accent as he mocked the former Alabama senator, according to a report on the book published Tuesday in the Washington Post.

“This guy is mentally retarded. He’s this dumb Southerner. … He couldn’t even be a one-person country lawyer down in Alabama,” the commander-in-chief said about Sessions, the first senator to back his longshot candidacy.

But Sessions quickly fell from favor after he recused himself from special counsel Robert Mueller’s probe of Russian election interference and possible collusion with Trump’s campaign.

Porter was forced out after two ex-wives accused him of domestic violence.

Woodward’s revelation came a day after Trump once again belittled Sessions — for allowing the Justice Department to indict a pair of allegedly crooked GOP lawmakers, whom Trump called “very popular.”

“Two long running, Obama era, investigations of two very popular Republican Congressmen were brought to a well publicized charge, just ahead of the Mid-Terms, by the Jeff Sessions Justice Department. Two easy wins now in doubt because there is not enough time. Good job Jeff,” he wrote, referring to California Rep. Duncan Hunter and New York Rep. Chris Collins, who were both smacked with corruption charges by the feds last month.

“The Democrats, none of whom voted for Jeff Sessions, must love him now. Same thing with Lyin’ James Comey. The Dems all hated him, wanted him out, thought he was disgusting – UNTIL I FIRED HIM! Immediately he became a wonderful man, a saint like figure in fact. Really sick!” the commander-in-chief ranted in a second tweet.

Hunter and his wife, Margaret, illegally used campaign funds to pay personal bills big and small, from luxury vacations to kids’ school lunches and even a plane ticket for their pet rabbit, according to a stinging 47-page indictment.

They were charged with wire fraud, falsifying records, campaign finance violations and conspiracy after a Justice Department investigation that lasted more than a year.

Collins was accused in a 30-page indictment of tipping off his son — while attending a picnic at the White House — about the results of a failed drug trial that was about to crash the stock price of an Australian biotech company.

Passing along the information allegedly allowed Collins’ son, Cameron, and six other investors to avoid a combined $768,000 in losses by selling shares of Innate before their price plunged 92 percent.

Collins, a Republican who represents the area between Buffalo and Rochester, was the first member of Congress to endorse Trump’s candidacy. Hunter was the second.

Democrats howled that Trump expected his AG and the Justice Department to serve his political needs — and even some Republicans slammed the president.

“The United States is not some banana republic with a two-tiered system of justice — one for the majority party and one for the minority party,” Sen. Ben Sasse (R-Nebraska) said in a statement.

“These two men have been charged with crimes because of evidence, not because of who the president was when the investigations began. Instead of commenting on ongoing investigations and prosecutions, the job of the president of the United States is to defend the Constitution and protect the impartial administration of justice.”