"The president's power to assert executive privilege is very well established", White House spokeswoman Sarah Huckabee Sanders said Monday.
Comey is scheduled to testify before the Senate Intelligence Committee on Thursday as part of an investigation into possible collusion between Trump and Russian Federation as well as Moscow's alleged meddling in the 2016 presidential election.
Comey's appearance before the Senate Intelligence Committee as part of its Russia-related investigation will be his first public testimony since his firing on 9 May.
President Donald Trump signs a decision memo and a letter to members of Congress outlining the principles of his plan to privatize the nation's air traffic control system in the East Room at the White House, Monday, June 5, 2017, in Washington.
That ended speculation that Trump may try to block potentially explosive Comey testimony on Thursday.
Swedish art gallery satire "The Square" wins Palme d'Or at Cannes
Coppola accepted her award and gave thanks to director Jane Campion for being a role model, according to the Hollywood Reporter . Kidman wasn't at the French Riviera ceremony on Sunday night but sent a video message from her home in Nashville, Tennessee.
Legal experts have also said that the president is likely to have undermined his ability to assert executive privilege by publicly discussing his dealings with Mr Comey in tweets and interviews.
Trump asked Comey to drop the Flynn investigation, said a person who was given a copy of a memo Comey wrote about the conversation. The Supreme Court has found that presidents enjoy a right to confidentiality in communications with their advisers but it is not an absolute privilege and courts have overriden such claims in the past.
In the weeks since, associates of Comey have said the former director felt uncomfortable about efforts by Trump to compromise the bureau's traditional independence. The White House has denied the president made that request.
"It becomes the testimony of one person", Zeldin said, "one who will then become Robert Mueller's witness in the grand jury investigation in which they will determine whether or not obstruction occurred".
Protesters assembled in Washington and other USA cities on Saturday in a "March for Truth" to demand an independent investigation into alleged connections between Trump's campaign and Russian Federation.