President Trump went on a late-night Twitter tirade on Tuesday, attacking Bob Woodward’s bombshell book in which he’s accused of calling Attorney General Jeff Sessions “mentally retarded” and “a dumb southerner.”

The president pushed back in all caps against the famed Watergate journalist, whose “Fear: Trump in the White House” painted a grim picture of a White House in disarray.

“The already discredited Woodward book, so many lies and phony sources, has me calling Jeff Sessions ‘mentally retarded’ and ‘a dumb southerner.’ I said NEITHER, never used those terms on anyone, including Jeff, and being a southerner is a GREAT thing. He made this up to divide!” Trump tweeted at 11:01 p.m., hours after the Washington Post ran excerpts of “Fear.”

Trump has been angry with Sessions ever since the nation’s top prosecutor recused himself from the ongoing Russian collusion investigation.

The already discredited Woodward book, so many lies and phony sources, has me calling Jeff Sessions “mentally retarded” and “a dumb southerner.” I said NEITHER, never used those terms on anyone, including Jeff, and being a southerner is a GREAT thing. He made this up to divide! — Donald J. Trump (@realDonaldTrump) September 5, 2018

Sessions, a former senator from Alabama who was one of the first lawmakers to back Trump in the 2016 GOP primaries, took himself out of the probe due to his role in the campaign.

Trump’s exasperation with Sessions spilled over in one private conversation, according to Woodward, with the president telling former staff secretary Rob Porter: “This guy is mentally retarded. He’s this dumb Southerner … He couldn’t even be a one-person country lawyer down in Alabama.”

And just before midnight, Trump also retweeted news reports of Defense Secretary James Mattis taking issue with Woodward’s book.

In the reports, Matties denied he’s had to explain the basics of world politics to Trump.