'Slippery' Comey was 'worst Federal Bureau of Investigation director in history'

President Donald Trump on Sunday continued to attack former FBI Director James Comey with a series of tweets aimed at undercutting the credibility of his upcoming book, "A Higher Loyalty".

The attacks come hours before Comey's interview with ABC's George Stephanopoulos was scheduled to air Sunday night.

Comey, who ran the Federal Bureau of Investigations for nearly four years, portrays the president in the book as a liar, dumb and rude, and he compares elements of Trump's behavior to that of a Mafia boss. "His "memos" are self serving and FAKE!"

He questioned Comey's intelligence and place in history, writing, "Slippery James Comey, a man who always ends up badly and out of whack (he is not smart!), will go down as the WORST FBI Director in history, by far!" "No golf and grandkids talk (give us all a break)!" tweeted Trump.

Trump has claimed he chased Comey because of his tackling of the research of the Federal Bureau of Investigation.

Trump's morning tweet comes ahead of Comey's interview with ABC to be broadcast in full on Sunday evening.

"I said to him, 'Sir that's up to you but you want to be careful about that because it might create a narrative that we're investigating you personally and, second, it's very hard to prove something didn't happen", Comey said.

Donald Trump issues full pardon to former aide to Dick Cheney
Trump's action, calling it a shot across the bow and a warning to the special counsel, Robert Mueller , pursuing him. In a statement, Dick Cheney called Libby "one of the most capable, principled, and honorable men I have ever known".

Trump tweeted five times Sunday on the issues. "It was smaller than mine, but did not seem unusually so", Comey reportedly wrote in his book, describing the moment he first met the president past year.

His silly theory is based on the findings contained in a fraudulent, debunked dossier pieced together during the 2016 presidential election at the behest of failed Democrat presidential nominee Hillary Clinton and the Democrat National Committee.

When Trump fired Comey in May 2017, the administration cited a memo written by Deputy Attorney General Rod Rosenstein criticizing Comey's handling of the inquiry into Clinton's email server.

Trump has continued to allege that McCabe was deferential to Hillary Clinton during the FBI's investigation of Clinton's use of a private email server because McCabe's wife took donations from a Clinton ally for a state Senate race in Virginia. But he says he also thinks he did the ideal thing by going making his own announcement noting that the Justice Department had done in other high profile scenarios.

He casts Mr Trump as a mafia boss-like figure who sought to blur the line between law enforcement and politics and tried to pressure him regarding his investigation into Russian election interference. The president appears to be referring to passages in A Higher Loyalty in which Comey wrote that he had a "tortured half-in, half-out approach" to the investigation into Clinton's emails.

"I never asked Comey for Personal Loyalty".

Meetings with Trump gave Comey "flashbacks to my earlier career as a prosecutor against the Mob", he says.