President Trump revealed "highly classified information" to two top Russian officials during a controversial Oval Office meeting last week, according to a report from The Washington Post.

The Post, citing current and former U.S. officials, reported Monday evening that the information relayed by the president to Russian Foreign Minister Sergey Lavrov and Ambassador Sergey Kislyak "jeopardized a critical source of intelligence" on ISIS:

"The partner had not given the United States permission to share the material with Russia, and officials said Trump's decision to do so endangers cooperation from an ally that has access to the inner workings of the Islamic State. After Trump's meeting, senior White House officials took steps to contain the damage, placing calls to the CIA and the National Security Agency.

" 'This is code-word information,' said a U.S. official familiar with the matter, using terminology that refers to one of the highest classification levels used by American spy agencies. Trump 'revealed more information to the Russian ambassador than we have shared with our own allies.' "

Trump also reportedly boasted to the Russians about the intelligence he was receiving, telling the two men, "I get great intel. I have people brief me on great intel every day":

"Trump went on to discuss aspects of the threat that the United States learned only through the espionage capabilities of a key partner. He did not reveal the specific intelligence-gathering method, but he described how the Islamic State was pursuing elements of a specific plot and how much harm such an attack could cause under varying circumstances. Most alarmingly, officials said, Trump revealed the city in the Islamic State's territory where the U.S. intelligence partner detected the threat.

"The Washington Post is withholding most plot details, including the name of the city, at the urging of officials who warned that revealing them would jeopardize important intelligence capabilities."