Attorney General Jeff Sessions will testify in an open hearing before the Senate Intelligence Committee on Tuesday, be open to the public, according to the committee's leaders. The newspaper noted that it doesn't exclude the possibility of recordings created by another entity.
CNN previously reported that congressional investigators are examining whether Sessions had an additional private meeting with the Russian ambassador in April 2016 at the Mayflower Hotel in Washington.
But he says the president "believes that the sooner we can get this addressed and dealt with" the better.
Spicer also declined to say whether Trump agrees with Sessions' decision to testify.
Comey testified that the FBI investigation into possible collusion between Russian Federation and the Trump campaign did not extend to Trump himself during the time Comey was leading the FBI.
Former White House press secretary Ari Fleischer advised Trump to "stop talking" Sunday before he finds himself in legal trouble.
"I'll tell you about that maybe sometime in the near future", the president told reporters on Friday during a White House news conference.
Russian Federation has denied interfering in the USA election.
Comey also has said Sessions did not respond when he complained he did not "want to get time alone with the President again".
Mr Sessions recused himself from the inquiry in March after media reports that he had been in two previously undisclosed meetings a year ago with Russian ambassador Sergei Kislyak.
"Lordy, I hope there are tapes", Comey said at his hearing before the Senate Intelligence Committee on Thursday.
It will be the first sworn public testimony from Sessions, a longtime former senator, since he was nominated by President Donald Trump and confirmed as the nation's top law enforcement officer in February. Feinstein said she was especially concerned after National Intelligence Director Dan Coats and National Security Agency Director Michael Rogers refused to answer questions from the intelligence committee about possible undue influence by Trump.
In his defense, Sessions could cite a memo written by Deputy Attorney General Rod Rosenstein that criticized Comey over the Hillary Clinton email investigation. Warren said she is looking forward to finding out more about Sessions' role in Comey's firing, although the White House suggested Sessions could invoke executive privilege during his testimony depending on "the scope of the questions".
Conway also said Comey's testimony showed President Donald Trump was not under investigation. And if he acknowledges he had some concerns, he will open up a new line of questioning about the conduct of President Trump and his advisers.
"I hope you can see your way clear to letting this go, to letting Flynn go", Comey quoted Trump as saying.
The White House disputed the characterization, calling it offensive.
Even if the tapes were real, the GOP aide added, they would probably prove Comey's side of the story and undercut the President's version of events.
On Tuesday, Sessions will have the chance to give his own answer in person - or explain to senators what other conversations he and Trump may have had on this subject about which Comey might not have been aware.