How would President Trump react to a terrorist attack on U.S. soil? 17 foreign policy experts, historians, psychologists and biographers weigh in.The responses were surprising, and at times unsettling. The saber-rattling statements that excite his supporters also suggest he has disregard for linchpins of the global order like NATO, the Geneva Conventions and the hard-won global nuclear-weapons limits. Some focused on Trump’s apparent hesitancy about sending troops into combat, and predicted he’d act more like Obama thanBush. Some foresaw a country newly divided, with patrols stalking Muslim neighborhoods & religious hatreds bubbling to the surface. One biographer, familiar with Trump’s primal response to any perceived insult, drew a frightening picture of a quickly escalating set of attacks and responses, with major cities caught in the crossfire