Just last week President Donald Trump told NBC News' Lester Holt that his unprecedented meeting with the Russian foreign minister and ambassador to the U.S. in the Oval Office was a "public" meeting. The Washington Post now has reported that Trump "revealed highly classified information" to the Russians during his recent meeting.
In an online post published later on Monday, BuzzFeed quoted an unnamed U.S. official who confirmed the substance of the Post's article, while adding, "It's far worse than what has already been reported."
Of course, discussing sources and methods is not necessary to compromise them. Often the intel itself makes clear just what those sources and methods are.
Throughout the course of his campaign, Trump repeatedly attacked Democratic nominee Hillary Clinton for maintaining a private email server and thereby risking the exposure of insufficiently secured classified information.