U.S. President Donald Trump, in his first comment on a guilty plea by his first national security adviser Michael Flynn to lying to the FBI, said on Saturday there was "absolutely no collusion" between his campaign and Russia.

"What has been shown is no collusion, no collusion," Trump told reporters at the White House as he left Washington for fundraisers in New York.

Flynn is cooperating with prosecutors investigating Russian meddling in the 2016 presidential campaign after admitting on Friday that he lied to FBI agents.Later on, Trump said on his official Twitter account that he had to fire Flynn because he lied to the VP and FBI, but "there was nothing to hide!"

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