A day before a high-stakes hearing, the leaders of the House Intelligence Committee said Sunday there's no evidence to back President Trump's claims that Barack Obama wiretapped him, though the Republican chairman said investigators are looking at other types of possible surveillance of Trump and his aides during last year's campaign.
"These hearings are not likely to resolve the issue", she said, adding there are too many unanswered questions.
"If we get to the point at any time where I feel we can't do that, where there are legitimate lines of investigation that are being walled off, then I will say so".
In a BBC interview published Saturday, National Security Agency deputy Rick Ledgett called the suggestion - which a White House spokesman conveyed to reporters - that British intelligence might have helped spy on Trump "just insane".
"There was no FISA warrant that I'm aware of to tap Trump Tower, that's correct", Nunes said.
In Richmond, Virginia, Attorney General Jeff Sessions told reporters that he never gave Trump any reason to believe he was wiretapped by the previous administration, according to a transcript provided by CBS News.
During his Fox News appearance, Nunes said he has seen no evidence of collusion between Trump associates and the Russians during the election.
Intelligence Committee Chairman Devin Nunes (R) and ranking Democrat, Adam Schiff, speak Thursday at the U.S. Capitol how they have found no evidence to support President Donald Trump's assertion Trump Tower was wiretapped.
Several congressional panels have launched investigations into Russia's alleged interference, including the House and Senate intelligence committees, which have jurisdiction over the nation's 17 intelligence agencies, and the House and Senate judiciary committees.
Nunes said the committee will also examine whether the Russians were trying to sow doubt in the US electoral system or whether they were trying to help Trump get elected to the White House.
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Non-Opec compliance has been a concern with some estimates suggesting only 60 per cent compliance so far. On Thursday, OPEC member Kuwait said this week that it was ready to prolong the deal to reduce supply.
Recent headlines and statements have focused on whether Obama ordered Trump Tower to be wiretapped during the campaign.
"You're going to find some very interesting items coming to the forefront over the next two weeks", Trump said.
Trump fired his national security adviser, Michael Flynn, last month after he failed to disclose s with Russia's ambassador before Trump took office on January 20.
Intelligence officials have said that Russian Federation was behind the theft of Democratic National Committee emails last summer.
Meanwhile, Sen. Ted Cruz seemed to back Trump, at least in spirit.
Domestically, the controversy over the wiretapping claim has pulled attention away from Trump's effort to push through other key items on his agenda, including the planned repeal of Obama's healthcare law, tax reform and his controversial travel ban.
"I am concerned that this hearing will not be quite as instructive as a lot of us and a lot of Americans would want because so much of the information lives in a classified world", Himes said. Mark Warner, the committee's Democratic vice chairman, said.
But Trump's fellow Republicans, who control majorities in both the Senate and House of Representatives, say the probes by congressional committees are sufficient.
White House spokesman Sean Spicer even suggested this week that Trump may have been under surveillance as part of information that was incidentally collected during an investigation focused elsewhere.
"I'm confident they're going to hold every Marine accountable", Cotton said, adding that he thought it was possible the scandal might extend beyond the Marines and could involve members of the Army, Navy and Air Force.