(Reuters/NAN) The reports that U.S. President Donald Trump has revealed highly classified information about a planned Islamic State operation to Russia’s foreign minister are “fake”, Interfax news agency.

Interfax cited the Russian foreign ministry as saying this on Tuesday.

Two U.S. officials alleged on Monday that Trump disclosed highly classified information to Russia’s foreign minister about a planned Islamic State operation, plunging the White House into another controversy just months into Trump’s short tenure in office.

The intelligence, shared at a meeting with Russian Foreign Minister Sergei Lavrov and Russian Ambassador Sergei Kislyak, was supplied by a U.S. ally in the fight against the militant group, both officials with knowledge of the situation said.

The White House declared the allegations, first reported by the Washington Post, incorrect.

“The story that came out tonight as reported is false,” H.R. McMaster, Trump’s national security adviser, told reporters at the White House, adding that the leaders reviewed a range of common threats including to civil aviation.

“At no time were intelligence sources or methods discussed. The president did not disclose any military operations that were not already publicly known…I was in the room. It didn’t happen,” he said.

The White House also released a statement from Secretary of State Rex Tillerson, who said the Oval Office meeting focused on counterterrorism, and from Deputy National Security Adviser Dina Powell, who called the Washington Post story false.

Still, the news triggered concern in Congress.

The Senate’s No. 2 Democrat, Dick Durbin, called Trump’s conduct “dangerous” and “reckless”.

Bob Corker, the Republican head of the Senate Foreign Relations Committee, called the allegations “very, very troubling” if true.

Obviously, they’re in a downward spiral right now and they’ve got to come to grips with all that’s happening,” he said of the White House.

The latest controversy came as Trump’s administration reels from the fallout over his abrupt dismissal of former FBI Director James Comey and amid congressional calls for an independent investigation into allegations of Russian meddling in the 2016 U.S. election.

One of the officials said the intelligence discussed by Trump in his meeting with Lavrov was classified “Top Secret” and held in a secure “compartment” to which only a handful of intelligence officials have access.

After Trump disclosed the information, which one of the officials described as spontaneous, officials immediately called the CIA and the National Security Agency, both of which have agreements with a number of allied intelligence services around the world, and informed them what had happened.

The U.S. officials said while the president has the authority to disclose even the most highly classified information at will, in this case he did so without consulting the ally that provided it, which threatens to jeopardize a long-standing intelligence-sharing agreement.

Since taking office in January, Trump has careened from controversy to controversy, complaining on the first day about news coverage of his inauguration crowds; charging his predecessor, former President Barack Obama, with wiretapping.

Trump, a Republican who has called allegations of links between his campaign team and Russia a “total scam,” sharply criticised his 2016 election rival, Democrat Hillary Clinton, for her handling of classified information as secretary of state, when she used a private email server.

The FBI concluded that no criminal charges against Clinton were warranted, but Comey said she and her colleagues had been “careless” with classified information.