Biden "deeply concerned" by possible leak of U.S. intel about Israel's plans for Iran, White House says

Washington — President Biden is "deeply concerned" by the possible leak of U.S. intelligence documents regarding Israeli preparations for an attack on Iran, which the Pentagon is investigating, National Security Council spokesman John Kirby said Monday. 

Kirby told reporters the Biden administration can't yet say if the classified information that became public over the weekend on the messaging app Telegram was leaked or the result of a hack, but the president will be "actively monitoring" the progress of the investigative efforts. 

"I know the Department of Defense is investigating this, and I'm sure that as they work through that, they'll try to determine the manner in which they did become public," Kirby said. "We're deeply concerned, and the president remains deeply concerned, about any leakage of classified information in the public domain. That is not supposed to happen, and it's unacceptable when it does."