Former FBI director James Comey has unleashed on Donald Trump in his latest television interview, describing the US President as someone who will "stain everyone around him".
Appearing on ABC News in America, Mr Comey said that was the challenge faced by the Trump administration.
"The question is, how much stain is too much stain and how much stain eventually makes you unable to accomplish your goal of protecting the country and serving the country?" he told anchor George Stephanopoulos.
He also said it was possible Russia was holding something over Mr Trump.
"These are more words I never thought I'd utter about a president of the United States, but it's possible," he said.
"I wish I wasn't saying it, but it's just — it's the truth."
Mr Comey answered "possibly" when asked if the President was attempting to obstruct justice when he cleared the Oval Office of other officials last February and encouraged him to close the investigation into then national security adviser Michael Flynn, who pleaded guilty last December to lying to the FBI and is now cooperating with special counsel Robert Mueller's Russia investigation.
Mr Comey also said he believed Mr Trump was "morally unfit" to be president and that he treated women like "pieces of meat".
"A person who sees moral equivalence in Charlottesville, who talks about and treats women like they're pieces of meat, who lies constantly about matters big and small and insists the American people believe it — that person's not fit to be president of the United States, on moral grounds," he said.
Mr Comey is currently promoting his new tell-all book, A Higher Loyalty,which is reportedly very critical of Mr Trump.
In the book, Mr Comey compares Mr Trump to a mafia don and calls his leadership of the country, "ego driven and about personal loyalty".
It is due to be released later this week.
Earlier today, Mr Trump described Mr Comey on Twitter as a "slippery" and unintelligent man who was "the worst FBI director in history".
"[He] always ends up badly and out of whack," he tweeted.
Mr Comey's book offered his version of the events surrounding his firing as FBI director by Mr Trump and the investigations into Russian election meddling and Hillary Clinton's email practices.
In an excerpt shown on Saturday, Mr Comey said his belief Mrs Clinton would beat Mr Trump in the 2016 presidential election was a factor in his decision to disclose the investigation into her emails.
Mr Trump seized on that, saying Mr Comey, "was making decisions based on the fact that he thought she was going to win, and he wanted a job. Slimeball!"
He also suggested Mr Comey should be imprisoned, saying: "How come he gave up Classified Information (jail), why did he lie to Congress (jail)."
There is no indication Mr Comey is under investigation for doing either.
More to come.