Unexpectedly, Milley’s executive officer came into the office and passed him a handwritten note: “Speaker Pelosi would like to speak to you ASAP. Topic: Succession. Twenty-fifth amendment.” Speaker Nancy Pelosi, a California Democrat, was second in line to succeed the president after the vice president and received detailed briefings on the command and control of U.S. nuclear weapons. The 34-year House veteran was steeped in all national security, military and intelligence matters.

