It is a simple fact that no president in American history brought less foreign policy experience to the White House than Donald J. Trump. The real estate developer from Queens promised to bring his brash, zero-sum swagger to bear to cut through America's most complex national security issues, and he did. If the cost of his America First agenda was bulldozing the edifice of foreign alliances that had been carefully tended by every president from Truman to Obama, then so be it.

Very quickly, it became clear to a number of people at the highest levels of government that their gravest mission was to protect America from Donald Trump. Trump and His Generals is Peter Bergen's riveting account of what happened when the unstoppable force of President Trump met the immovable object of America's national security establishment--the CIA, the State Department, and, above all, the Pentagon. If there is a real deep state in DC, it is not the FBI so much as the national security community, with its deep-rooted culture and hierarchy. The men Trump selected for his key national security positions, Jim Mattis, John Kelly, and H. R. McMaster, were products of that culture: Trump wanted generals, and he got them. Three years later, they would be gone, and the guardrails were off.