U.S. Rep. Jared Polis on Monday called for an independent investigation into President Donald Trump's connections with the Russian government.

He also raised the specter of collusion during the campaign.

Shortly after Polis' comments, Washington Post reported Trump himself leaked highly classified information to the Russian foreign minister while meeting with him in the Oval Office.

The information divulged by Trump could reveal information about a "critical source of intelligence" regarding the Islamic State.

"These reports are consistent with the reckless behavior we have come to expect of President Trump," Polis said via email. "I sincerely hope that he did not reveal secret information to the Russians that might violate our international agreements and make it harder for us to get good intelligence about [the Islamic State] and other threats in the future."

Polis, a Democrat whose district includes Fort Collins, was an original co-sponsor and is now one of almost 200 that signed a House of Representatives resolution to form a commission to look at Russian or other foreign involvement in the 2016 elections.

That resolution was introduced at the start of the 2017 Congress. It's almost exclusively signed onto by Democrats in a Republican-controlled Congress and hasn't gone anywhere.

Despite the minority-party status, Polis noted in a Coloradoan editorial board meeting before the Monday town hall in Fort Collins that Democrats still have some pull in Congress.

He advocated for Democrats refusing to cooperate with Republicans until an independent commission is formed. The GOP could potentially need his party's support to pass a new debt limit and avoid the United State's defaulting, he said.

At the town hall meeting at Rigden Farm Senior Living, Polis predicted criminal indictments for people associated with Trump and his campaign. Polis didn't make any specific predictions or predictions about specific individuals.

He cited press reports and noted his committees don't have access to secret information. He serves on the House rules, ethics and education and workforce committees.

Polis pointed out controversies involving Gen. Michael Flynn, who has been subpoenaed by the Senate Intelligence Committee over communications with Russia and his registeration retroactively as a foreign agent, and former campaign adviser Carter Page's contacts with Russia.

"I think the big question in Washington is, 'Was President Trump involved? Did he know about illegal activity, did he direct illegal activity?'" Polis said. I have no idea about any of that stuff. But it certainly appears as thought Carter Page, Gen. Flynn and perhaps other associates of the Trump campaign engaged in illegal acts.

"At the very least, it was lying about meetings with foreign governments, obviously. What is certainly possible is that it also involved collusion."

U.S. Sen. Michael Bennet, D-Colorado, wrote on Twitter that if the Post report is true, then Trump should explain himself.

"Sharing intelligence with an adversary risks jeopardizing counterterrorism cooperation with partners and undermines U.S. national security," he tweeted.

Spokespeople for U.S. Sen. Cory Gardner, R-Colorado, did not respond to requests for comment Monday afternoon.