President Donald Trump took a shot at James Comey Friday amidst the former FBI Director’s ongoing media blitz to promote a new book detailing some of his interactions with the president.

James Comey is a proven LEAKER & LIAR. Virtually everyone in Washington thought he should be fired for the terrible job he did-until he was, in fact, fired. He leaked CLASSIFIED information, for which he should be prosecuted. He lied to Congress under OATH. He is a weak and….. — Donald J. Trump (@realDonaldTrump) April 13, 2018

….untruthful slime ball who was, as time has proven, a terrible Director of the FBI. His handling of the Crooked Hillary Clinton case, and the events surrounding it, will go down as one of the worst “botch jobs” of history. It was my great honor to fire James Comey! — Donald J. Trump (@realDonaldTrump) April 13, 2018

Comey’s book details several accusations against Trump and maligned his personal character. The former FBI director claims among other things that the President asked him for a pledge of loyalty at a private dinner in the White House, which he likened to the behavior of a “mob boss.”

“This president is unethical, and untethered to truth and institutional values,” he writes in his book, adding “His leadership is transactional, ego driven and about personal loyalty.”

Comey also detailed his interactions with Trump after his election in which he briefed him about sexual allegations included in the salacious Fusion GPS dossier.