A review of Justice Department documents indicates there is no evidence behind Donald Trump's claim Trump Tower was wiretapped, the House intelligence committee chairman has said.
The President has defiantly refused to back down from his explosive claim that Barack Obama wiretapped his phones.
He also sidestepped any blame for the White House decision to highlight an unverified report that Britain helped carry out the alleged surveillance.
Mr Trump’s unproven allegations against his predecessor have left him increasingly isolated, with fellow Republican as well as Democratic lawmakers saying they’ve seen nothing from intelligence agencies to support his claim.
But Mr Trump, who rarely admits he’s wrong, has been unmoved, leaving his advisers in the untenable position of defending the President without any credible evidence.
Last week, White House spokesman Sean Spicer turned to a Fox News analyst's contention GCHQ had helped Mr Obama wiretap Trump Tower.
Fox News anchor Shepard Smith said the network could not independently verify the reports from Andrew Napolitano, a former judge and commentator who has met with Mr Trump.
GCHQ vigorously denied the charges in a rare public statement, saying the report was “utterly ridiculous and should be ignored.”
Mr Nunes said a leak involving Mr Trump’s former aide Michael Flynn was “the one crime we know” of in his investigation into accusations of Russian interference in the US election.
“The one crime we know that’s been committed is that one: the leaking of someone’s name ...”Mr Nunes told Fox News.
He said the panel was investigating whether other names were leaked.