Firing back at a sharply critical book by former FBI director James Comey, President Donald Trump blasted him Friday as an “untruthful slime ball,” saying, “It was my great honor to fire James Comey!” Trump reacted on Twitter early Friday, the day after the emergence of details from Comey’s memoir, which says Trump is “untethered to truth,” and describes him as fixated in the early days of his presidency on having the FBI debunk salacious rumors he said were untrue but that could distress his wife.