The allegations of wiretapping are part of a broader House Intelligence Committee investigation over accusations of Russian meddling in the 2016 election.
"I hope that we can put an end to this wild goose chase because what the president said was just patently false, and the wrecking ball it created now has banged into our British allies and our German allies", Schiff said.
"The information we received Friday continues to lead us in that direction".
Lawmakers are also eyeing former national security advisor Michael Flynn as another potential point of conflict. Chicago time as President Donald Trump deplores as "fake news" stories suggesting potential links between people in the Trump orbit and Russian Federation.
Asked whether the committee has seen evidence of collusion between the Trump campaign and Russian Federation, he said: "I'll give you a very simple answer: No". Trump also hinted more evidence to back his allegation was forthcoming.
Republican Sens. Tom Cotton of Arkansas and Susan Collins of ME also said Sunday they had seen no evidence that the Obama administration had placed Trump under surveillance at Trump Tower, the Manhattan high-rise that houses Trump's residence, business office and campaign office.
House Intelligence Committee Chair Devin Nunes (R-CA) said on Sunday that he is not aware of any foreign intelligence surveillance court (FISA) warrant for surveillance of Trump Tower.
Comey and Admiral Mike Rogers, the head of the National Security Agency, have agreed to testify before the House committee on issues related to Russia's role in the election.
"We're expecting directors Comey and Rogers to shed light on Russia's active measures undertaken during the 2016 election campaign, the USA government's response, the compilation of the Intelligence Community's January 6 report on these events, and on related questions concerned possible surveillance on Trump campaign associates and on possible leaks of classified information", he said.
"I'll give you a very simple answer: No", he said.
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SCORER: At 25.3 points per game , South Dakota State's Mike Daum is the NCAA's second-highest scorer this season. Reed Tellinghuisen , a 6-6 junior guard/forward, is the only other player in double figures at 11.9.
Cotton, a veteran and member of the Senate Armed Services Committee, also touched on major military issues in the news.
But the hearing could become heated as Republicans balance support for their party's leaders and Democrats vent frustration over Republican congressional leaders' refusal to appoint a special prosecutor or select committee to investigate.
The wiretapping issue mushroomed last month, when Trump's national security adviser Michael Flynn was forced to resign after it was revealed he had misled top officials over his contacts with Russian Federation.
Key senators said Thursday they did not have evidence to support Trump's wiretapping accusation.
As they took to the airwaves to offer differing opinions about the Russian Federation matter, members of Congress nearly all struck similar notes on Trump's unsubstantiated claim that President Barack Obama wiretapped his phones at Trump Tower in NY during the campaign.
The Arkansas Republican also called for the defeat of ISIS, but said the United States needs to counter Iran, whose activities he blamed, in part, for the rise of ISIS.
The question remains whether the agency has opened a criminal investigation into possible ties between Trump campaign aides and Russian officials.
"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.
Trump did little to clarify his wiretapping claims during a joint press conference with German Chancellor Angela Merkel at the White House Friday.
"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.