...several people close to the president have recently told me in private: that Trump is “unstable,” “losing a step,” and “unraveling.”

...There’s a new level of concern. NBC News published a report that Trump shocked his national security team when he called for a nearly tenfold increase in the country’s nuclear arsenal during a briefing this summer. One Trump adviser confirmed to me it was after this meeting disbanded that Secretary of State Rex Tillerson called Trump a “moron.”