McMaster denies claims that Trump revealed highly classified info to Russians

US National Security Advisor H. R. McMaster says President Donald Trump did not reveal highly classified information about Daesh terrorists to Russians.

During a meeting at the White House last week, the president shared classified information with Russian Foreign Minister Sergey Lavrov and Russia's ambassador to the US, Sergey Kislyak, The Washington Post claimed in a report.

McMaster appeared before reporters on Monday to deny the report, asserting that it "is false" and "at no time were any intelligence sources or methods discussed."

"I was in the room. It didn't happen," said the American general.

Earlier, US Secretary of State Rex Tillerson said Trump discussed "the nature of specific threats" during the meeting, "but they did not discuss sources, methods or military operations."

The sensitive information was said to have been provided by a US ally, and revealing it could jeopardize the United States, the newspaper said, adding that the CIA was unwilling to comment on the matter.

Trump has been under investigation over possible collusion with the Kremlin during the 2016 presidential campaign and transition.