Comey's testimony is expected to address the circumstances around his firing and his alleged conversations with Trump about the investigation.
Spokeswoman Sarah Sanders says the president's power to invoke privilege is "well-established". The president and aides can not be compelled to testify about private conversations, but Comey is appearing before senators voluntarily.
Comey, fired last month as FBI director amid a federal investigation into connections between Russian Federation and the Trump campaign, is set to testify Thursday at a highly anticipated congressional hearing that could shed light on his private conversations with the president in the weeks before his dismissal.
President Trump will not try to assert executive privilege over conversations with James Comey, a spokesperson said Monday, clearing the way for the ex-FBI director's testimony before Congress on Thursday. Comey's conversations and meetings with Trump were memorialized in memos written by the former Federal Bureau of Investigation director.
Ex-FBI chief Comey to testify next week in Russian Federation probe
As it turns out, Nunes is likely guilty of the same innocuous intelligence practice he's tried to paint as a smoking gun for that allegation.
Comey probably will be asked about conversations he had with Trump concerning Russian election meddling and the FBI investigation into former national security adviser Michael Flynn. The power dates back to U.S. vs. Nixon, the 1974 Supreme Court case.
Trump to date has limited his socializing to the White House and his Trump-branded properties.
"That committee hearing was just notice and I think, obviously, it has got to be reviewed", he said.
Trump asked Comey to drop the Flynn investigation, said a person who was given a copy of a memo Comey wrote about the conversation.
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"The claim of executive privilege requires that the communications in question be confidential".
But Mr Trump's office put an end to that speculation on Monday, saying: "President Trump will not assert executive privilege regarding James Comey's scheduled testimony". "Arguably, Trump has himself breached that confidentiality", Harvard Law professor Noah Feldman said in a Bloomberg op-ed.
A member of the Senate intelligence committee says "we've seen no smoking gun at this point" regarding collusion between the Trump campaign and the Russian government during the 2016 USA presidential election.
Correction: Noah Feldman's statement originally appeared in a Bloomberg op-ed.
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