He wanted Comey to consider "letting this go" after Trump's first national security adviser, Michael Flynn, was forced to resign after misrepresenting to Vice President Pence conversations he'd had during the presidential transition with Russia's ambassador.
Comey acknowledged in congressional testimony a year ago that after he was sacked he helped leak his personal, but unclassified, memos of his conversations with Trump to a reporter.
Former FBI chief James Comey said his belief that Hillary Clinton would be elected USA president in 2016 "was a factor" in his handling of the probe into her misuse of a private email server while she was secretary of state.
Trump tweeted six times Sunday on the issues. Virtually everyone in Washington thought he should be fired for the bad job he did-until he was, in fact, fired.
He also suggested Comey should be imprisoned, saying "how come he gave up Classified Information (jail), why did he lie to Congress (jail)". "He lied to Congress under OATH". He is a weak and. Comey takes care to mention that he brought with him the Federal Bureau of Investigation director at the time, a man named Robert Mueller.
During his time as FBI Director, Comey was criticized by Democrats and Republicans alike.
Biggest revelations from former FBI Director James Comey's new book "A Higher Loyalty".
Reuters and other news outlets have obtained copies of Mr Comey's book before its formal release this week.
Asked by NBC's Chuck Todd if he felt Comey was a "man of integrity", Ryan stated that what he knows of Comey would indicate he is.
Stephanopoulos asked if Trump had a right to know about the source of funding.
"As far as I know, " Ryan replied. "It wasn't necessary for my goal, which is to alert him we have this information".
The book also includes strikingly personal jabs at Trump that appear created to irritate the president.
The excerpts from Mr Comey's memoir have infuriated the U.S. president, who insisted that he "never asked Comey for personal loyalty" and the he "hardly even knew this guy".
"I don't think it's necessary, " he said. "I knew I would need to remember those conversations both due to their content and because I knew I was dealing with a chief executive who might well lie about them". It's lead headline is "PEE BRAIN!" - a reference to unconfirmed allegations in the dossier that Trump had watched prostitutes urinate on themselves in a Moscow hotel suite.
"A Higher Loyalty" is an intimate view of FBI investigations and prosecutions over Comey's career.
- Comey writes that during the meeting he kept thinking of the NY mafia from his experience as a federal prosecutor in Manhattan, and how the Trump team's behaviour was aimed at making the intelligence community part of his group - his "Cosa Nostra".
"Unbelievably, James Comey states that Polls, where Crooked Hillary was leading, were a factor in the handling (stupidly) of the Clinton Email probe". Mueller, however, has re-emerged at the center of the Trump legal drama - the special counsel named by the Justice Department to continue the investigation of Russian interference in the 2016 election begun under Comey.