Continuing to attack the investigation into Russian interference in the 2016 elections, and any links to his campaign, President Donald Trump on Sunday went on Twitter to directly question the veracity of former top officials of the FBI, accusing them of lying, and making up information to use against him in the Special Counsel's Russia investigation.

As he attacked former FBI Director James Comey, and recently fired top FBI official Andrew McCabe, Mr. Trump appeared to be watching television on Sunday morning, citing one of his favorite Fox News programs, Fox and Friends.

"Wow, watch Comey lie under oath," the President tweeted at one point, moving on to take more jabs at McCabe, who was fired on Friday, as Mr. Trump used Twitter to seemingly try to undermine evidence which might be used against him in the Russia probe.

"I don't believe he made memos except to help his own agenda, probably at later date," the President wrote about contemporaneous notes which FBI officials took after interactions with Mr. Trump, are now in the possession of the Special Counsel's office. "Can we call them the fake memos?"

It wasn't immediately clear what prompted the President's FBI salvos on Sunday.

On Twitter in recent days, Mr. Trump has again focused his ire on the investigation being led by Special Counsel Robert Mueller, once more making the argument that the FBI went easy on Hillary Clinton's email investigation, and showed bias on the Trump-Russia probe.

"The Mueller probe should never have been started in that there was no collusion and there was no crime," the President tweeted, ending with a familiar line: "WITCH HUNT!"

Mueller's probe has already netted a series of guilty pleas from people who worked for the President's campaign, with two specifically pleading guilty to lying about contacts involving Russia.

As the President used Twitter as his bully pulpit, one of the President's lawyers also stirred the pot by saying it was time to end the Mueller investigation, which many in Washington believe is far from being complete.

Democrats in Congress again warned the President not to try to end that probe.

"What, Mr. President, are you hiding from the American people?" said Rep. Ted Lieu (D-CA).

"Thou doth protest too much, methinks," said Rep. David Cicilline (D-RI).

"This shows how scared the Trump Administration is about what Mueller will find," said Rep. Carolyn Maloney (D-NY). "This investigation must continue."