President Donald Trump can't seem to stop talking about his predecessor.
Burr and Warner are leading one of three congressional investigations into Russia's interference in the 2016 election, including whether Trump associates were in contact with the Kremlin.
"There is no question that there were surveillance techniques used throughout this", Mr Spicer said.
He said Trump believes the evidence will "vindicate him". An Obama spokesman said that was "simply false".
The House intelligence committee is to begin hearings Monday into Russia's role in cybersecurity breaches at the Democratic National Committee.
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"The point is, the intelligence committees in their continuing, widening, ongoing investigation of all things Russian Federation, got to the bottom - at least so far - with respect to our intelligence community that - that no such wiretap existed", Ryan told reporters.
The unusually strong, bipartisan statement left little room for the White House to continue its defense of Trump's extraordinary allegations that implied that former president Barack Obama engaged in a possible criminal act.
The two cited media reports that said both the Federal Bureau of Investigation and Justice Department were involved, raising questions about the "content and context of Mr. Flynn's discussions with Russian officials".
Other influential Republicans, including Sen.
FBI Director James Comey was scheduled to brief top members of the Senate judiciary committee Wednesday afternoon in response to a separate request about the resignation of former National Security Adviser Michael Flynn and his contacts with Russian officials.
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Republican Richard Burr, chairman of the Senate Intelligence Committee, and the committee's Democratic vice chair Mark Warner, said in a statement that they had received no information to support Trump's claim, made in a tweet on March 4.
How low has President Obama gone to tapp my phones during the very sacred election process. "This is Nixon/Watergate. Bad guy!", Trump tweeted. Lindsey Graham, R-South Carolina, and Sheldon Whitehouse, D-Rhode Island, confirmed that they gave Comey until this past Wednesday to inform the Senate Judiciary Subcommittee on Crime and Terrorism about whether the FBI is investigating President Trump's wiretapping claim about Obama.
"As I told you last week about the issue with the president talking about tapping Trump Tower, that evidence still remains the same, that we don't have any evidence that that took place", Nunes told reporters. A government source, who requested anonymity when discussing sensitive information, said an initial examination of the material turned over by the Justice Department indicates that it contains no evidence to confirm Trump's claims that the Obama administration had wiretapped him or the Trump Tower in NY.
In recent days, Trump and his aides have attempted to redefine the president's claims, saying that his use of the wiretapping term covers a variety of surveillance techniques.
Trump, in an interview Wednesday with Fox News, predicted there would be "some very interesting items coming to the forefront over the next two weeks".
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