Senate Minority Leader Chuck Schumer (D-N.Y.) said Tuesday on the Senate floor that the "country is being tested in unprecedented ways" following an explosive new report that said President Trump asked FBI Director James Comey to end an investigation into former national security adviser Michael Flynn.

Trump later fired Comey, and publicly criticized him as a showboat.

Schumer warned congressional Republicans could pay the price for not standing up to Trump.

"The country is being tested in unprecedented ways. I say to all of my colleagues in the Senate: history is watching," he said in brief remarks from the floor.

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According to The New York Times, Comey wrote in a memo that the president told him, regarding the Flynn investigation, "I hope you can let this go."

The allegation comes as Capitol Hill is still trying to digest a Washington Post report from Monday alleging Trump disclosed classified information to top Russian officials.

Schumer, who noted he was "shaken" by the New York Times report, added that "on a day when we thought things couldn’t get any worse they have."

"We are only one day removed from stunning allegations that the president may have divulged classified information to a known adversary," he said.

Democrats are pressuring Republicans to break with Trump and back a special prosecutor to look into Russia's meddling in the 2016 election, including potential ties between the Trump campaign and Moscow.

"Concerns about our national security, the rule of law, the independence of our nation’s highest law enforcement agencies are mounting," Schumer said.