He then turned blame to President Obama's administration, former Democratic presidential candidate Hillary Clinton and the intelligence committee amid a new report of USA agencies intercepting phone calls made ahead of the presidential election from members of Trump's campaign team and Russian intelligence officials.
"Those are criminal leaks" by people angry about Democrat Hillary Rodham Clinton's loss in the election, he told reporters. The report identifies Trump's former campaign chairman Paul Manafort as one of the associates who made the alleged calls.
His resignation Monday came after a tumultuous few days in which Flynn increasingly lost support from Trump and key White House officials, even as members of Trump's inner circle publicly contradicted each other about Flynn's fate.
He also said he did not think that Russian President Vladimir Putin was taking actions that would test him early in his term in office.
After railing against leaks from the intelligence community, Trump said that the leaks that have made it into the press are, in fact, real, but that the news is still "fake".
Speaking in the East Room of the White House, Trump said the media were "out of control", interrupted questions and singled out stories with which he disagreed.
The Russian connection that Trump attempts to downplay could be more serious than many people think, despite President Trump's assertion that he has no business or personal contacts in Russia and as far as he knows of, no one else on his team does either.
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"Tomorrow, they will say, 'Donald Trump rants and raves at the press.' I'm not ranting and raving".
Mr. Trump's impromptu press conference at the White House that lasted for 75 minutes was dominated by questions regarding alleged links of his advisers to Russian Federation.
"The leaks are real", Trump said. They are planning their own investigations into the relationship between Trump's aides and Russian Federation.
The New York Times reported on Tuesday that intercepted communications showed Trump's campaign advisers were in repeated contact with Russian intelligence officials in the year before the election.
Law enforcement sources tell CBS News it is unlikely former National Security Adviser Michael Flynn will face charges in connection to his discussions of us sanctions with the Russian ambassador to the U.S. Jim, you know what it is, here's the thing, the public isn't - they read newspapers, they see television, they watch.
"No, I didn't direct him, but I would have directed him if he didn't do it. OK?"
Trump defended both his decision to fire Michael Flynn after the National Security advisor acknowledged that he had given the Vice President and others incomplete information and his decision to not tell Mike Pence that he received false information.
"To be honest, I inherited a mess - at home and overseas - a mess", the president, who has served for less than a month, said, adding that "ISIS has spread like cancer". I'm just telling you. That's for sure. But I'm having a good time. "I'm really not a bad person, by the way".