Rep. Mike Quigley (D-Ill.) on Monday said President Trump is trying to "obstruct" the investigation into Russian meddling in the 2016 presidential election and urged those in the White House to cooperate with it.

"I would suggest to the White House, if this is indeed fake news, then they have nothing to worry about," he said during an interview on CNN's "New Day."

"Let's see what those tapes say with your interview, discussion or dinner with the director, and tell your people at the White House and in the campaign to fully cooperate with the House, Senate and the Justice Department."

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He said the American public has a "right to know" what happened.

During the interview, Quigley also said there is "probable cause" to move forward on the probe into potential collusion between the Trump campaign and Russia.

"We're finding more dots, and we're connecting more dots. If the American public heard what I'd heard and read what I'd read, Democrat and Republican would certainly want us to go forward on a full-throttle basis," he said.

"Whether there's collusion, what I tell folks is the comparison is, if it was a criminal case, at this point, there's probable cause to believe we should go forward as to whether there was collusion between the Trump campaign and Russians."

Quigley said the investigation is going to "take awhile."

"It makes it a lot more difficult when the president of the United States is oblivious to all of this, calls it fake news and, quite frankly, obstructs it," he said.

The Illinois Democrat also went after Trump for his firing last week of FBI Director James Comey.

"It's clear he's doing everything he can to obstruct the investigation," he said, "and we can't let him do that.'

The firing drew heavy criticism from Democrats and some Republicans, with a number of people comparing it to former President Richard Nixon's Watergate scandal, which led to his resignation.