Burnett asks Nadler: Why isn't Ivanka Trump on your list?
The aggressive, broad investigation could set the stage for impeachment, although Democratic leaders have pledged to investigate all avenues and review special counsel Robert Mueller's report before taking drastic action.
The House Intelligence, Foreign Affairs and Government Oversight committees say they wrote to acting White House Chief of Staff Mick Mulvaney and Secretary of State Mike Pompeo seeking documents and interviews on Trump's communications with Putin.
"Personally I think he has", he replied, "but we have to, we have to look and see".
According to Kavanagh, even if Democrats can't get Trump on collusion, it's highly likely that they're going to go after POTUS on campaign finance violations linked to hush payments made prior to the 2016 presidential election to Trump's alleged mistress Stormy Daniels.
The House Oversight and Reform Committee has launched multiple investigations.
Comey was leading an investigation into Russian activities in the 2016 U.S. presidential election and possible collusion with Trump's campaign when the president fired him in May 2017.More news: Meghan Markle's baby shower swag and how much it's all worth
The committee is also asking the Federal Bureau of Investigation, the Justice Department and others for documents related to possible pardons for Trump's former personal lawyer, Michael Cohen, former national security adviser Michael Flynn and former Trump campaign chairman Paul Manafort.
In a letter to the White House, the committee asks for information surrounding former Federal Bureau of Investigation director James Comey's termination, communications with Justice Department officials, the Trump Tower meeting and multiple other matters.
Warner said he will reach his decision on whether Trump colluded with Russian Federation to help him win the election after more investigation.
The top Republican on the committee, Georgia Rep. Doug Collins, said Nadler was "recklessly prejudging the president for obstruction" and pursuing evidence to back up his conclusion.
Various current and former Trump administration officials have been hit with document requests, including Steve Bannon, Sean Spicer, Michael Flynn, Paul Manafort, Roger Stone, Donald Trump Jr., Eric Trump and Jared Kushner, among others. He emerged empty-handed from a high-profile summit with North Korea leader Kim Jong Un on denuclearization, and Trump's former personal attorney, Michael Cohen, in three days of congressional testimony, publicly characterized the president as a "con man" and "cheat".
Nadler said that Republicans - who controlled both chambers of Congress until January, when Democrats took the majority in the House following their wins in November's midterm elections - have "shielded" the President.
"We will act quickly to gather this information, assess the evidence and follow the facts where they lead with full transparency with the American people", Nadler said. They said they intend to probe "the substance of any communications during in-person encounters and phone calls, the existence and contents of any documents related to the communications, what the effects of the communications have been on the nation's foreign policy, whether the president or anyone acting on his behalf have sought to hide those communications and whether the president or anyone acting on his behalf have failed to create records or mishandled those records in violation of federal law". As of this writing, there is no record of the president's face-to-face interactions with the Russian leader at five locations over the past two years, even in classified files, USA officials said according to the Washington Post.