Milley worried that Trump could 'go rogue,' the authors write.

"You never know what a president's trigger point is," Milley told his senior staff, according to the book.
In response, Milley took extraordinary action, and called a secret meeting in his Pentagon office on January 8 to review the process for military action, including launching nuclear weapons. Speaking to senior military officials in charge of the National Military Command Center, the Pentagon's war room, Milley instructed them not to take orders from anyone unless he was involved.

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Surprised CNN would allow this to be put out in the open.