According to the officials present, Trump’s advisers, among them the Joint Chiefs of Staff and Secretary of State Rex Tillerson, were surprised. Officials briefly explained the legal and practical impediments to a nuclear buildup and how the current military posture is stronger than it was at the height of the build-up. In interviews, they told NBC News that no such expansion is planned.

The July 20 meeting was described as a lengthy and sometimes tense review of worldwide U.S. forces and operations. It was soon after the meeting broke up that officials who remained behind heard Tillerson say that Trump is a “moron.”