Internal polling memos obtained during the book's research showed that the Trump political team monitored specific voter focus groups regarding ongoing issues.
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The administrative dynamic shifted away from the presence of moderating forces, replaced instead by a strict emphasis on loyalty among core personnel.
"Loyalty is the premier characteristic that they looked for in the transition," Haberman said.
The book also tracks how executive decisions bypassed traditional agency reviews entirely, accelerating the pace of federal policy implementation.
Swan noted that the scale of executive authority exercised during this period marked a definitive break from previous historical precedents.
"It occurred to Maggie and I a few months into covering this second term that, A, it was, as Maggie said, unrecognizable from the first term," Swan said.
"But, B, it was also unrecognizable from any American presidency in our lifetime and, in some respects, from any American presidency full stop in the way that he was using power."
The authors concluded that the governance style observed throughout the year represents an unprecedented evolution in how the American presidency wields its power.
"So it occurred to us that we were covering a form of regime change in this country, in the United States," Swan said.
The book's findings draw directly from high-level focus groups and internal strategic data compiled by the president's closest political operatives.
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