President Donald Trump insisted Friday that James Comey is a liar and a leaker, despite what former FBI Director been saying during his media tour.

Trump said in one of his most brutal barbs at Comey yet that the fired law enforcement official is 'either very sick or very dumb' and he 'lied all over the place' to hide his crimes.

'Is everybody believing what is going on. James Comey can’t define what a leak is,' Trump said in response to Comey's appearance Thursday on Fox News.

Trump said, 'He illegally leaked CLASSIFIED INFORMATION but doesn’t understand what he did or how serious it is. He lied all over the place to cover it up. He’s either very sick or very dumb. Remember sailor!'

Former FBI Director James Comey once again denied allegations by President Donald Trump that he leaked classified information and said his memos were 'like a diary' Thursday evening on Fox News. Trump fired back in a Friday morning tweet

Trump said in one of his most brutal barbs at Comey yet that the fired law enforcement official is 'either very sick or very dumb' and he 'lied all over the place' to hide his crimes

Comey had denied allegations by Trump on Fox that he leaked classified information. He claimed the memos that the Justice Department released last were 'like a diary' and that information that is secret now was only retroactively classified.

The former FBI director appeared on Fox on Thursday where he defended his decision to give his memos which contained his recollections of conversations with Trump to a number of associates.

'That memo was unclassified then,' Comey told Fox host Bret Baier. 'It's still unclassified. It's in my book. The FBI cleared that book before it could be published.'

Comey is promoting his new book, A Higher Loyalty, which recalls his meetings with Trump and the events leading up to his firing.

Comey gave an interview on Thursday to Bret Baier, an anchor for Fox News

Watch the latest video at <a href="http://www.foxnews.com">foxnews.com</a>

Trump and his allies have accused Comey of leaking classified information. But Comey says that the information he shared with others was not classified.

One of the individuals who received his memos was Daniel Richman, a Columbia University law professor.

Comey says he gave the memos to Richman and 'asked him to get the substance of it out to the media.'

'I don't consider what I shared with Mr. Richman a leak,' Comey told Fox News.

The ex-law enforcement official says he also gave copies of the memos to other members of his 'legal team.'

Trump called in to Fox & Friends and slammed Comey as a 'liar and a leaker' who is 'guilty of crimes'

'I gave the memos to my legal team after I gave them to Dan Richman - after I asked him to get it out to the media,' he said.

Comey has been criticized for releasing the memos since FBI officials are bound by an employment agreement that bars them from 'reveal[ing], by any means, any information or material from or related to FBI files or any other information acquired by virtue of my official employment to any unauthorized recipient without prior official written authorization by the FBI.'

Comey says, however, that the memos were personal, not official.

'I didn't consider it part of an FBI file... It was my personal aid to memoir,' Comey said.

'I always thought of it as mine, like a diary,' he said.

Last week, The Wall Street Journal reported that the Justice Department's inspector general launched a review as to whether Comey violated rules by revealing classified information.

During his Fox News appearance, Comey confirmed that he has been interviewed by the inspector general.

'And I expect a report on them,' Comey said. 'Not on the handling of classified information because that's frivolous, but on, "Did I comply with policy? Did I comply with my employment agreement?" '

Trump called in to Fox & Friends earlier in the day and slammed Comey as a 'liar and a leaker' who is 'guilty of crimes.'

'He leaked classified information to get a special counsel and leaked the memos which are classified – the memos were about me and he didn't write those memos accurately. He wrote a lot of phony stuff,' the president said on Thursday.

Comey responded, saying Trump was making a 'false statement' and that the president was 'just wrong.'

'He leaked classified information to get a special counsel and leaked the memos which are classified – the memos were about me and he didn't write those memos accurately. He wrote a lot of phony stuff,' the president told Fox & Friends (above) on Thursday

'Facts really do matter, which is why I'm on the show to answer your questions,' he said.

Comey also said he did not know that Democrats had funded the infamous dossier compiled by a former British spy that contained unverified claims about Trump and Russian prostitutes.

Republicans say that the dossier was used as the basis to obtain a FISA warrant to surveil a member of Trump's campaign, Carter Page.

Comey said that there was other information about Page's alleged ties to Russian intelligence that authorities used as the basis to obtain a FISA warrant.

The former FBI chief also talked about FBI officials Peter Strzok and Lisa Page.

Strzok and Page were found to have exchanged text messages disparaging Trump. The revelation has fueled claims that the FBI is biased against the president.

Comey told Fox News that he would have 'removed both of them from any contact with significant investigations' if he was aware of the texts.

'It was such poor judgment,' Comey said. 'When I saw the text, I was deeply disappointed in them.'

He added: 'But I never saw any bias, any reflection of any kind of animus towards anybody.'