Even after the Senate committee's statement, Spicer insisted Thursday afternoon that the president "stands by" the claim that Obama ordered surveillance of Trump Tower.
Ahead of the hearing, the committee sent a letter to the FBI, CIA and the National Security Agency requesting details by Friday about Americans who surfaced in intelligence collections previous year.
Their respective counterparts on the House of Representatives Intelligence Committee, Devin Nunes and Adam Schiff, made similar comments on Wednesday, Efe news reported.
The House intelligence committee will begin holding public hearings on Monday.
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.
The Republican and Democratic leaders of the Senate Intelligence Committee joined the chorus of lawmakers stating they are not aware of any evidence supporting President Trump's claim that his campaign headquarters was wiretapped during the presidential election.
It will provide a rare chance for lawmakers to grill the Federal Bureau of Investigation director and other officials in a public setting on the allegations that Russian Federation intervened in the campaign in an attempt to tilt it toward Trump.
On Monday, the House panel sent the Justice Department a letter asking for copies of any court orders related to Trump or his associates which might have been issued past year under an electronic surveillance law or a wide-ranging anti-crime statute. Lawmakers have since turned the question back toward the administration, asking the Justice Department to provide evidence of wiretapping activity.
A spokesman for the former President dismissed the allegation as "simply false", while legislators from both parties called on Trump to produce evidence of the surveillance or retract the charge.
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Nunes says he doesn't believe there was "an actual tap of Trump Tower" in NY.
Longtime Trump adviser Roger Stone says he believes his contacts with a Russian-linked hacker who took credit for breaching the Democratic National Committee may have been obtained through a FISA warrant.
Two of the government's highest-ranking intelligence officials will go before a House committee next week to testify about President Trump's bombastic claim that his predecessor "tapped" his phones during the 2016 election. That allows the government to collect the communications of individuals suspected of being agents of a foreign power.
Stone said he was unaware at the time that USA officials believed the hacker had ties to Russian Federation.
White House press secretary Sean Spicer on Tuesday said Trump is "extremely confident" that the Justice Department will produce evidence to back up his assertion.
"I've been reading about things", Mr Trump said. Asked Wednesday if he had ever briefed Trump on the investigation or given the president any reason to believe he had been wiretapped by the Obama administration, Sessions said, "The answer is no".
Other influential Republicans, including Sen.
The committee members had to push for full access to information collected by the CIA, FBI and other agencies, but more recently they have said their access has improved.
"We're not here to listen to speeches", Nunes said.