Former FBI Director James Comey to testify in Senate June 8

The controversy over Comey's firing escalated after it was revealed that he had drafted a memorandum detailing how Trump had allegedly pressured him to end the FBI's investigation into former national security adviser Michael Flynn.

A congressional aide tells NBC News that the Senate intelligence committee has long expected that Comey would testify sometime next week and anticipated that he would speak to Mueller in advance to clear what he can and cannot discuss so as not to impede the federal investigation.

After Comey's dismissal, news reports emerged that Trump asked Comey to end the Flynn probe during a February meeting in the Oval Office the day after Flynn was sacked for misrepresenting his contacts with the Russian ambassador.

Mr Farage has dismissed that report as "hysterical".

"The committee welcomes the testimony of former director Comey, but does not have an announcement to make at this time", said Rebecca Glover, spokeswoman for Republican committee chairman Richard Burr.

Former FBI Director James Comey will testify before the Senate intelligence committee June 8 about the investigation into possible coordination between the campaign of President Donald Trump and Russian officials.

The committee will also ask questions on Mr Comey's role in the development of the USA intelligence agencies' assessment that Russian Federation meddled in the United States presidential election and any possible collusion with Mr Trump's campaign. It marked the first time the White House had officially acknowledged that outside counsel had been retained.

  • Leroy Wright