Nunes went onto clarify that if you're reading Trump's tweets literally then "clearly the President was wrong".
On 4 March, Mr Trump sparked a furore when wrote on his @realDonaldTrump Twitter account that Mr Obama had tapped into communications at Trump Tower, New York home to the president and first family, before the 8 November election.
As Obama, F.B.I. Director James Comey, and former Director of National Intelligence James Clapper Jr. all denied that any such surveillance had taken place, the White House backtracked, eventually pushing the responsibility to investigate the president's claim onto Congress.
The Justice Department missed Nunes's deadline to provide evidence Monday, which drew Nunes's subpoena threat. But on Tuesday, Spicer said Trump was "extremely confident" he would be vindicated by the evidence. He added that they want the Justice Department to respond to requests for information before their March 20 hearing on the matter.
The White House has asked those committees to also investigate Trump's unverified wiretapping allegations against Obama. Despite media and government calls for Trump and his administration to provide evidence of their claims, so far none has materialized.
Schiff said Comey would be asked publicly whether he has seen any evidence that substantiates Trump's claim. Devin Nunes, R-Calif., told reporters. Richard Burr the Senate panel chairman stated that they have had talks with all the right people and the committee has enough responses to concerning the wiretapping claims.
In a response Monday evening, the Justice Department said it needed extra time to "review the request in compliance with the governing legal authorities and to determine what if any responsive documents may exist".
USA intelligence agencies said in January that Russian Federation had conducted cyber attacks on Democrats in an effort to influence the 2016 US election on Trump's behalf. Chuck Grassley have both said they will hold up hearings for Rod Rosenstein, Trump's nominee to serve as deputy attorney general, unless they get more information from the Federal Bureau of Investigation.
"For a long time here I have been very clear about my concern about, number one, the incidental collection on Gen. [Michael] Flynn, how that was put into a product, how it was unmasked, how it was leaked to the public", Nunes said.