In a March 15 interview, Fox News host Tucker Carlson asked Trump why he didn't ask the agencies about any possible surveillance on him or his campaign before tweeting about it, given that the White House appears to have no evidence to backup his claims.
If no evidence of wiretapping at Trump Tower emerges, his credibility would be newly damaged.
House Intelligence Chairman Devin Nunes and ranking member Rep. Adam Schiff have flatly said that Trump Tower was clearly not wiretapped.
White House Press Secretary Sean Spicer speaks during the daily press briefing in the Brady Press Briefing Room at the White House in Washington, DC on March 16, 2017.
The hearing is related to the committee's ongoing investigation into alleged Russian meddling in the 2016 election.
Trump initially said on Twitter that his phones at Trump Tower were "wire tapped" by former President Barack Obama during the campaign. Spicer told reporters that when the same committees made statements refuting allegations of Trump's collusion with Russian Federation, "there was crickets from you guys". Mark Warner, the committee's Democratic vice chairman, said.
"This just shows we have a really unsafe situation for the country", he said on MSNBC's "For the Record" Thursday. "There is a ton of media reports out there that indicate that something was going on during the 2016 election", Spicer said. They disagree on a variety of policies, including immigration, trade, defense spending and the role of the European Union, but on Friday the two were cordial.
The accusations - flatly denied by Obama - were at first seen as frivolous, spur-of-the-moment comments after a politically bruising week, which Trump and his team could later retreat from without much damage.
"There was no such wiretap activity mounted against the president-elect at the time as a candidate or against his campaign", Mr. Clapper said last week on NBC's "Meet The Press".
The breadth of the probe also includes looking into whether Trump or any of his associates had any connections to the Kremlin and what federal agencies unmasked names of USA citizens who were picked up via incidental collection of surveillance.
"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. "This is Nixon/Watergate. Bad guy!", Trump tweeted.
President Trump dismissed questions about his still-unfounded claim that President Obama ordered surveillance of him with a joke Friday and revived one of the most troublesome diplomatic episodes of Obama's tenure in the process.
"We've made clear to the administration that these claims are ridiculous and they should be ignored and we've received assurances that these allegations will not be repeated", May's spokesman told reporters.