President Trump has no plans to invoke executive privilege in an attempt to block fired FBI Director Jim Comey from discussing in his testimony before Congress this week any conversations he had with the president, two White House advisers told ABC News. According to a Comey memo reported by the New York Times last month, Trump had asked Comey to lay off his agency's investigation into former national security adviser Mike Flynn.

Trump later fired Comey, prompting the appointment of Robert Mueller, Comey's predecessor as FBI director, as a special counsel to investigate the extent of Russia's interference in the USA election, whether there was collusion with the Trump campaign and whether Trump attempted to obstruct the investigation.

White House spokesman Sean Spicer said Friday that President Trump was considering whether to invoke executive privilege to stop Comey's appearance.

Comey, who was leading the Federal Bureau of Investigation's probe into alleged Russian meddling in last year's U.S. presidential election, was sacked by Trump last month, four years into his 10-year term.

Additionally, he may be impeded in answering questions about the conversations everyone really wants to know about: those that Comey had with the President. Why?

He's expected to echo remarks made last week from former CIA Director John Brennan, who told lawmakers he was "worried" after the US intelligence committee discovered "a number of" contacts between Trump associates and Russian operatives. In fact, he testified in early May that he had not been pressured at all for political purposes to end any investigation, which strongly suggests that Trump's questions about Flynn were just clumsy attempts to help out a friend - as Comey also apparently thought at the time. But legal experts say Trump likely undermined those arguments because he's publicly discussed the conversations in tweets and interviews.

"I do think American people should hear (from Comey)", Ernst told CNN.

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If Comey refuses to testify, Congress could subpoena him and then find him in contempt of Congress.

Presidents have often invoked executive privilege, and they have mostly failed when challenged in court.

His firing was immediately met with bipartisan concern, due to his involvement in a Trump-Russia investigation that has cast a shadow over current and former members of the Trump administration.

Russian President Vladimir Putin said he barely interacted with Flynn at a dinner in Moscow in 2015.

US intelligence agencies have concluded that Russian Federation meddled in the presidential election to hurt the bid of Democrat Hillary Clinton. Warner added, "I want to know what kind of pressure, appropriate or inappropriate, how many conversations he had with the president about this topic". And I got up and left.

When pressed on the magnitude of the Russia investigation as the committee enters an important week of hearings, Collins said "there is so much speculation and so many stories and so many leaks that it's very hard to determine the facts of the Russian involvement in our elections last fall, the extent to that of that involvement, and also whether or not there was collusion or collaboration with members of President Trump's campaign team". "That's the extent of my acquaintance with Mr. Flynn".