Spicer disputed this bipartisan statement, however, saying the committee has not been briefed by the Department of Justice, which is investigating the claims. He added that the president would ultimately be vindicated as investigations continue.
The Justice Department is expected to turn over any information relevant to Trump's claim on Monday, though it is unclear what, if any, evidence will be presented.
The Justice Department missed a Monday deadline for providing the information to the House and was given a one-week extension.
Sen. Lindsey Graham of S.C.is also expecting some answers. It does not say Obama ordered this surveillance, nor does it say Trump's own phones were tapped or that he was under surveillance in any way. He said he would be "submitting certain things" to a congressional committee and that he was considering speaking about the topic next week.
The Republican operative has acknowledged having a Twitter exchange with Guccifer 2.0, a hacker that US officials believe has ties to Russian Federation.
James Clapper, the longtime director of national intelligence under Obama, has said Trump's home and office were not wiretapped before the presidential election past year. One, that Obama himself - not the Federal Bureau of Investigation or intelligences agencies - ordered the tapping.
Article 50 to be triggered next week
A spokesperson for the European Commission said it was "ready to begin negotiations" and it had "everything ready and decided". Meanwhile, Britain's Institute for Government has said as many as 15 new Parliamentary Bills may be needed due to Brexit.
Identities of Americans who show up in US surveillance against foreign targets are generally concealed, but can be unmasked by intelligence agencies in certain circumstances. That allows the government to collect the communications of individuals suspected of being agents of a foreign power.
He also insisted that media outlets had not reported when, one day earlier, House Intelligence Chairman Devin Nunes said it is possible Trump staffers might have been surveilled via "incidental" collection of information. In fact, the author stipulates: "It is not clear whether the intercepted communications had anything to do with Mr. Trump's campaign, or Mr. Trump himself". Spicer aggressively pushed back on journalists' questions about the apparent disconnect and read from a long list of news articles - reporting he said was further verification of the president's claims and "merit looking into".
But two weeks later, the White House has doubled down on the extraordinary accusation against a former president despite calls from his own Republican Party to recant and apologize, and despite a stern rebuke from London. "The president used the word wiretap in quotes to mean, broadly, surveillance and other activities", White House press secretary Sean Spicer told reporters on Tuesday.
The Russian government has rejected accusations by USA intelligence agencies it worked to influence the election in Trump's favour.
He said they had "enough problems" and that the Central Intelligence Agency itself had been hacked during the Obama administration and "had a lot of things" taken.
Given Sessions' recusal, Rosenstein would take over responsibility for any probes touching the Trump campaign and Russia's election meddling if he's confirmed. "So now we're going to expand it to other forms of surveillance.' What's it going to be next?"