Donald Trump invited to testify over James Comey, Russian meddling

Trump also said he would be willing to speak to Robert Mueller, special counsel appointed by the Justice Department to investigate allegations that Russian Federation interfered in the 2016 presidential election.

President Donald Trump again took aim at former Federal Bureau of Investigation director James Comey on Sunday morning, suggesting in a tweet that Comey might have secretly released even more information to the public than he has already admitted to doing.

"We also were aware of facts that I can't discuss in an open setting that would make his continued engagement in a Russia-related investigation problematic", Comey said.

Mr Comey also told senators that he had leaked details of his memos about his conversations with Mr Trump to a friend, who passed them on to a reporter.

Mr Comey also claimed he took memos of his meetings with the president as he was concerned Mr Trump may lie about what was discussed.

Comey's testimony Thursday was part of that investigation.

Trump said Friday that he never told Comey that he hoped Comey could let his former national security adviser, Michael Flynn, off the hook in some way.

"Well, I'll tell you about that maybe sometime in the very near future", Mr Trump said.

Hours later, Mr Trump ignored reporters when asked about whether Mr Comey was telling the truth. Asked if he had taped their conversations, as he implied in a threatening tweet shortly after he fired Comey, Trump said he would reveal that answer soon.

Trump and Comey, who Trump fired on May 9, are now trading charges on who is a liar.

President Trump and Romania's President Klaus Iohannis at a press conference in the Rose Garden of the White House on Friday.

During nearly three hours of statements Thursday before the Senate Intelligence Committee, Comey described himself as "stunned" by Trump's "very disturbing" and "very concerning" behaviour in several of their meetings.

The Senate Judiciary Committee asked the White House last month about such tapes.

Comey said he did not know if Trump taped their conversations, but would be fine with them being released if they exist. "No, I didn't say that".

Intelligence agencies have concluded Russian Federation sought to interfere in the election, including by leaking hacked Democratic emails and engaging in propaganda efforts.

Trump's comments are referring to Comey's admission that he had leaked the written notes he'd kept during meetings with the President. A source familiar with the matter said Richman has been in touch with Senate judiciary through special counsel Bob Mueller's office, and that there will be movement after the weekend.

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