FELLOW Republicans are pressing President Donald Trump to come clean about whether he has tapes of private conversations with former FBI director James Comey.

The request is a sign of the escalating fallout from riveting testimony by Comey last week of undue pressure from President Trump, who has responded to the claim by accusing him of lying.

Meanwhile, the Senate probe into collusion with Russia or obstruction of justice is extending to a Trump Cabinet member, with Attorney General Jeff Sessions in for sharp questioning today by the Senate intelligence committee.

“I don’t understand why the President just doesn’t clear this matter up once and for all,” said Senator Susan Collins, a member of the committee, referring to the existence of any recordings.

She described Comey’s testimony as “candid” and “thorough” and said she would support a subpoena if needed. Trump “should voluntarily turn them over,” Collins added.

Senator James Lankford, also a member of the committee, agreed the panel needed to hear any tapes that exist. “We’ve obviously pressed the White House,” he said.

Trump’s aides have dodged questions about whether conversations relevant to the Russia investigation have been recorded, and so has the President.

Pressed on the issue, Trump said: “I’ll tell you about that maybe sometime in the very near future.”

Lankford said Sessions’s testimony will help flesh out the truth of Comey’s allegations, including Sessions’s presence at the White House in February when Trump asked to speak to Comey alone.

Comey alleges Trump then privately asked him to drop a probe into former national security adviser Michael Flynn’s contacts with Russia.

Comey also has said Sessions did not respond when he complained he did not “want to get time alone with the President again”.

The Justice Department has denied that, saying Sessions stressed to Comey the need to be careful about following appropriate policies.

“We want to be able to get his side of it,” Lankford said.

Senator Jack Reed said that “there’s a real question of the propriety” regarding Sessions’s involvement in Comey’s dismissal, because Sessions had stepped aside from the federal investigation into contacts between Russia and the Trump campaign. Comey was leading that probe.

Reed said he also wants to know if Sessions had more meetings with Russian officials as a Trump campaign adviser than have been disclosed.

Trump on Sunday accused Comey of “cowardly” leaks and predicted many more from him. “Totally illegal?” he asked in a tweet. “Very ‘cowardly!’”

Several Republican politicians also criticised Comey for disclosing memos he had written in the aftermath of his private conversations with Trump, calling that action “inappropriate”. But, added Lankford “releasing his memos is not damaging to national security”.

The New York City federal prosecutor who expected to remain on the job when Trump took office but ended up being fired said he was made uncomfortable by one-on-one interactions with the president - just like Comey was.

Preet Bharara told ABC’s This Week that Trump was trying to “cultivate some kind of relationship” with him when he called him twice before the inauguration to “shoot the breeze”.

He said Trump reached out to him again after the inauguration but he refused to call back, shortly before he was fired.

On Comey’s accusations that Trump pressed him to drop the FBI investigation of Flynn, Bharara said that “no one knows right now whether there is a provable case of obstruction” of justice. But added: “I think there’s absolutely evidence to begin a case.”