Last Updated May 15, 2017 10:59 PM EDT
President Trump The Washington Post.to Russian Foreign Minister Sergey Lavrov and Ambassador Sergey Kislyak last week, according to a report in
The extremely sensitive information was gathered by a U.S. ally united in the fight against the Islamic State in Iraq and Syria () and given on the basis that it remain private between the two parties. According to U.S. officials who spoke to the Post, Mr. Trump potentially jeopardized that relationship while also disclosing key ISIS-related intelligence.
In a briefing Monday evening,denied on behalf of the White House that Mr. Trump shared the reported classified intelligence.
The Post's report sent shockwaves through Capitol Hill on Monday, shaking up lawmakers who last week called into question Mr. Trump's relationship with Russia after he .
"[O]bviously they're in a downward spiral right now, they've got to figure out a way to come to grips with all the that's happening," Sen. Bob Corker, R-Tennessee, said when asked by asked by the story by reporters Monday evening.
"You know the shame of it is there is a real good national security team in place and there are good productive things that are underway through them and others. The chaos that is being created by the lack of discipline is creating an environment that I think makes, it creates a worrisome environment."
Sen. Bernie Sanders, I-Vermont, expressed concern for national security, saying in a tweet, "a week ago Trump fired Comey. Now this."
Sen. Mark Warner, D-Virginia, called the situation "a slap in the face to the intel community" and Sen. Richard Blumenthal, D-Rhode Island, said if true, Mr. Trump is "sabotaging our war against ISIS."
Sen. Martin Heinrich, D-New Mexico, drew comparisons between Mr. Trump's own alleged handling of the classified information and Mr. Trump's criticism of 2016 Democratic presidential candidate Hillary Clinton's use of a private email server, also describing the behavior as part of "a pattern of recklessness."
Sen. Sheldon Whitehouse, D-Rhode Island, made a similar joke on Twitter.
House Minority Leader Nancy Pelosi, D-California, also commented on the Post's report.
"Even if President Trump unwittingly blew a highly classified code-word source to the Russians, that would be dangerous enough," she said in a statement. "If the President outed a highly classified code-word source intentionally, that would be even more dangerous."
Sen. John McCain, R-Arizona, who also serves as chairman of the Armed Services Committee, tweeted of the report: "If true, deeply disturbing,"
CBS News' Alan He contributed to this report.