Donald Trump has unleashed another Twitter attack on the investigation into whether his presidential campaign colluded with Russia.

The US President fired off a series of tweets on Saturday evening and Sunday morning aimed at the team of Special Counsel Robert Mueller.

He also accused two former directors of FBI of lying.

The Twitter storm followed the firing of former acting FBI chief Andrew McCabe on Friday night.

Trump had long pressured his attorney general Jeff Sessions to remove McCabe, alleging bias in the FBI was behind investigations into his campaign.


Wow, watch Comey lie under oath to Senator G when asked “have you ever been an anonymous source...or known someone else to be an anonymous source...?” He said strongly “never, no.” He lied as shown clearly on @foxandfriends. — Donald J. Trump (@realDonaldTrump) March 18, 2018

As is often the case, Trump's tweets gave new momentum to a story which has dogged his White House and put allegations of Russian collusion firmly back in the headlines.

Trump's personal lawyer was this weekend reported to have called for the Mueller investigation to be brought to an end.

There has been speculation the President is planning to try to remove the Special Counsel.

Spent very little time with Andrew McCabe, but he never took notes when he was with me. I don’t believe he made memos except to help his own agenda, probably at a later date. Same with lying James Comey. Can we call them Fake Memos? — Donald J. Trump (@realDonaldTrump) March 18, 2018

It was also reported that McCabe, who was two days away from retirement when he was fired, had kept memos of his interactions with the President.

His former boss James Comey, who Trump fired last year, has testified that he kept similar notes.

Image: James Comey was sacked as FBI director last year

But Trump tweeted: "Spent very little time with Andrew McCabe, but he never took notes when he was with me. I don't believe he made memos except to help his own agenda, probably at a later date.

"Same with lying James Comey. Can we call them Fake Memos?"

Trump also returned to the theme of bias within the FBI.

"Why does the Mueller team have 13 hardened Democrats, some big Crooked Hillary supporters, and Zero Republicans?

Why does the Mueller team have 13 hardened Democrats, some big Crooked Hillary supporters, and Zero Republicans? Another Dem recently added...does anyone think this is fair? And yet, there is NO COLLUSION! — Donald J. Trump (@realDonaldTrump) March 18, 2018

"Another Dem recently added...does anyone think this is fair? And yet, there is NO COLLUSION!"

Mueller is a Republican who was appointed FBI director by former president George W Bush.

He was appointed by Special Counsel by Deputy Attorney General Rod Rosenstein, who was himself put in place by Trump. The President's own Attorney General Jeff Sessions put Rosenstein in charge of Mueller's investigation.

Trump had earlier repeated his claim that the investigation was opened under false pretences, blaming Hillary Clinton and the Democratic National Committee for swaying the secret intelligence court.

Mr. President, the American people will hear my story very soon. And they can judge for themselves who is honorable and who is not. — James Comey (@Comey) March 17, 2018

He wrote: "The Mueller probe should never have been started in that there was no collusion and there was no crime.

"It was based on fraudulent activities and a Fake Dossier paid for by Crooked Hillary and the DNC, and improperly used in FISA COURT for surveillance of my campaign. WITCH HUNT!"

The President's renewed attacks on Comey, whose firing prompted the appointment of the Special Counsel, prompted the former FBI director to tweet his own response.

He wrote: "Mr. President, the American people will hear my story very soon. And they can judge for themselves who is honorable and who is not."

Comey is due to publish his memoirs in April.