Defense Secretary James Mattis said he's "not worried" about President Trump revealing highly classified intelligence to Russian officials during a White House meeting, The Associated Press reported.

Mattis said the reports "never even came up" during talks he had Tuesday with three U.S. allies.

Reports on Monday said Trump revealed highly classified intelligence information to the Russian foreign minister and ambassador while meeting with them last week.

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Trump allegedly revealed “code-word information” related to threats from the Islamic State in Iraq and Syria that had been provided by a U.S. ally in the region, according to The Washington Post.

Trump on Tuesday tweeted that as president, he wanted to share facts with Russia related to "terrorism and airline flight safety," which he said he has an "absolute right to do."

Trump said during a later appearance Tuesday that he had a "great meeting" with Russia's foreign minister.