Rep. Will Hurd, a Republican from Texas, even took it one step further and called on Trump to apologize.
Collins, a member of the Senate Intelligence Committee, has said before that Trump should let the committee know about any evidence of his claim.
Trump remains under pressure from members of his own party to back off his claims of illegal wiretapping - particularly after the furor intensified last week when White House press secretary Sean Spicer suggested that British intelligence may have played a role in the surveillance.
Monday's hearing was also expected to address a second explosive issue: Trump's unsubstantiated accusations that the Obama administration wiretapped his phone at Trump Tower in NY during the campaign. "The House committee hearing tomorrow is going to be in part about the unsubstantiated allegations in the media and by some Democrats of collusion between Trump associates and Russian intelligence".
But it has also evolved into a political distraction at a time when Trump is facing fights over Obamacare repeal and the budget that will help define his first 100 days in office.
Monday's hearing promises to be a very public showdown between the Federal Bureau of Investigation and lawmakers, with the national security world certain to watch whether Comey drops a political bombshell on Washington.
CNN and others have reported that current and former law enforcement, intelligence and administration officials have said there were communications between Trump's associates and Russians known to U.S. intelligence during the campaign.
But the effort stumbled as every key congressional figure associated with intelligence oversight said there was no evidence of wiretapping. At the time, sources told CNN that the report would not back Trump's accusation.
Nunes added: "There was no FISA warrant I am aware of to tap Trump Tower".
The directors of the Federal Bureau of Investigation and National Security Agency will break their public silence on Monday about their investigations into possible links between Russian Federation and President Donald Trump's campaign at a rare open congressional intelligence committee hearing.
"I hope we can put an end to this wild goose chase", Schiff told NBC News' "Meet the Press."
Trump's tweets are not just causing a political kerfuffle; they've sparked worldwide diplomatic fallout. Trump's claims widened to two of the U.S.'s staunchest allies. Officials in London were livid that White House spokesman Sean Spicer cited an unsubstantiated report that Britain's Government Communications Headquarters - the British equivalent of the Central Intelligence Agency - had been used by Obama in the operation.
Trump raised the issue at a news conference Friday with German Chancellor Angela Merkel, quipping that they have something in common because her calls had been monitored by the United States. Such is the depth of feeling in Trump world that he is the victim of a plot by the establishment and the media to undermine his administration that he is unlikely to pay a heavy price among his devoted supporters.
The two House leaders did not agree, however, on whether the question of collusion between Trump campaign figures and Russian operatives has been settled.
"As far as wiretapping, I guess, by this past administration, at least we have something in common, perhaps", Trump told the German chancellor, referring to a WikiLeaks report in 2015 that the USA had monitored calls involving Merkel and her top aides for years. Sheldon Whitehouse gave FBI Director James Comey until Wednesday to inform them about whether or not the agency is investigating the Trump campaign's s with Russian Federation.
Collins said she supported Trump as president, but she wouldn't side with him if he "misstated what the facts are".
"If he didn't do it, (Trump) shouldn't be reckless in accusations that he did".
Since then, Trump has said he was speaking more generally about possible surveillance methods besides wiretaps.
Members of the House Intelligence Committee will press FBI Director James Comey to provide details of any investigation his agents are conducting over contacts between Donald Trump's associates and Russian Federation, during or after the presidential campaign. "No evidence of collusion". Nunes answered, "I think that's pretty clear".
"Yes. Do I think the president gets everything right?"
Congressional Republicans struggled Sunday to defend the president, but said they'd like to learn more.
The top Democrat on the intelligence committee, Rep. Adam Schiff of California, had a different perspective.
Former intelligence officials and others from business and academia are scheduled to testify.
The issue of wiretapping first surfaced 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 the Russian ambassador to Washington to discuss sanctions Obama had just announced against Russia over the election hacking. And congressional and public attention has turned to possible relations between Trump and Russian Federation. "And if there's an active criminal investigation, we need to allow law enforcement to do their job".
"At the outset of the investigation, there was circumstantial evidence of collusion". "I think the concern that we have is that, were there any other surveillance activities that were used".
"There is certainly enough for us to conduct an investigation", Schiff said.