U.S. President Donald Trump has accused the Justice Department's top officials and the FBI of politicizing the investigation into possible collision between Trump campaign officials and Russia during the 2016 US election, as the White House prepared to approve the release of a controversial secret Republican memo alleging FBI bias against him in its Russia probe.

President Trump on twitter posted: "The top Leadership and Investigators of the FBI and the Justice Department have politicized the sacred investigative process in favour of Democrats and against Republicans, something which would have been unthinkable just a short time ago".





The FBI had earlier in the week expressed "grave concerns about material omissions of fact" in the Republican memo, which they said has the potential to prompt high-level resignations in U.S. law enforcement agencies if released due to.

FBI Director Christopher Wray, appointed by Trump after he fired his predecessor James Comey, has been surrounded by speculation that he intends resign if Trump allows release of the memo. A White House official had on Thursday, to reporters that Trump was likely to give Congress the go ahead today, Friday, to release the document that has mesmerize Washington in recent days and ignite tensions between the Republican president and the nation's top domestic law enforcement agency.

Democrats insist the memo, commissioned by the Republican head of the House Intelligence Committee, Devin Nunes, is being used to target and derail investigations into Mr Trump and allegations that the Trump campaign colluded with Russia during the 2016 election campaign.

House Speaker Paul Ryan, a Republican, has played down the potential impact that might be cause by the memo's release on the federal inquiry led by Special Counsel Robert Mueller. The Speaker said Congress had a duty to make sure that surveillance powers were not been abused.


The inquiry was spurned out of the FBI's Russia investigation after Mr. Trump fired  former FBI Director, James Comey. Russia has repeatedly denied any collusion and Trump has called the probe a "witch hunt."