Republican Sen. Susan Collins on Tuesday morning called reports of President Donald Trump sharing sensitive information with Russian officials “very troubling” and asked that the Senate Intelligence Committee get briefed immediately on the issue.

“The disclosure of highly classified information has the potential to jeopardize sources and to discourage our allies from sharing future information vital to our security,” Collins, a member of the Senate Intelligence Committee, said in a statement. “There are conflicting reports about whether or not President Trump disclosed sensitive information to the Russians. Although the President has the legal authority to disclose classified information, it would be very troubling if he did share such sensitive reporting with the Russians.”

While Republicans are generally being cautious about blasting Trump before more information is revealed, the Republican chairman of the Senate Foreign Relations Committee on Monday night joined Democrats in chiding the president.

“To compromise a source is something that you just don’t do,” Sen. Bob Corker of Tennessee told reporters. “That’s why we keep the information that we get from intelligence sources so close, is to prevent that from happening.”