Former FBI Director James Comey will tell Congress on Thursday that President Donald Trump repeatedly urged him to halt a probe into his former national security adviser's ties to Russia and to declare publicly that Trump himself was not being investigated.

Axar.az reports citing Reuters.

Comey's testimony in the most widely anticipated congressional hearing in years will put the spotlight on whether Trump's comments about the Russia investigation were an attempt to obstruct the FBI probe that has dogged his 5-month-old presidency.

The outcome of Comey's testimony could have significant repercussions for Trump's 139-day-old presidency as special counsel Robert Mueller and multiple congressional committees investigate whether Trump's campaign team colluded with Russia to influence the 2016 presidential election.

The White House and Russia deny any collusion has occurred.

In written testimony released by the Senate Intelligence Committee on Wednesday, Comey quoted Trump as telling him the Russia investigation was a "cloud" that impaired his ability to operate as president.

In a one-on-one meeting in the Oval Office on Feb. 14, Comey's statement said, Trump asked him to drop an investigation of former national security adviser Michael Flynn, part of a wider probe into Russia's alleged meddling in the 2016 presidential election.

"I hope you can see your way clear to letting this go, to letting Flynn go," Comey quoted Trump as saying.