nbc news chief white house correspondent hallie jackson has all of the details. >> reporter: an extraordinary alarm sounded from the inside out, jaw-dropping charges against the president by someone who says they work for him. an anonymous source describing a secret cluster of top aides, quote, working diligently from within to frustrate parts of his agenda and his worst inclinations. i would know, the author writes, i am one of them. "the new york times" publishing that op-ed, choosing not to share who wrote it but describing them as an official whose job would be jeopardized if their job was revealed. the headline, i am part of the resistance inside the trump administration. >> when you tell me about some anonymous source within the administration, probably who is failing and probably here for all of the wrong reasons. if the failing "new york times" has an anonymous editorial -- can you believe it, anonymous? meaning gut less, a gutless editorial, we are doing a great job. >>...