From pulling out of the Trans-Pacific Partnership and the Paris climate accord, to questioning the value of NATO and imposing tariffs on European allies, to renegotiating NAFTA, to tearing up the Iranian nuclear agreement, to promising to pull troops out of Afghanistan and Syria in the not too distant future, President Trump is upending 70 years of foreign policy orthodoxy in pursuit of his “America First” agenda. Meanwhile, a rising China and a revanchist Russia are working feverishly to fill