White House National Security Adviser H.R. McMaster reiterated Tuesday that President Trump didn’t put national security at risk in a discussion with Russian diplomats last week about new threats posed by the Islamic State.

“The president in no way compromised sources or methods,” Mr. McMaster told reporters. “What the president shared was wholly appropriate.”

He said Mr. Trump didn’t even know where the information in question came from.

Mr. McMaster was referring to a published report that accused Mr. Trump of revealing highly classified information to the Russian foreign minister in a White House meeting. He again called the report “false.”

“I stand by my statement,” he said.

The president’s national security adviser said the “real issue” is leaks in the administration to the media, and said those leaks should be investigated.

“Our national security has been put at risk by those violating confidentiality,” he said. “I think national security is put at risk by this leak and leaks like this.”

Asked if Mr. Trump revealed classified information, Mr. McMaster replied, “We don’t say what’s classified, what’s not classified.”

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