Trump’s sudden announcement Thursday of punishing tariffs on steel and aluminum imports, after a typically disorganized and opaque rollout, left much of the world feeling the whiplash that has rocked Washington all week. At home, stocks crashed on the President’s offhanded announcement, which could blow up into a trade war, while GOP leaders, stung by a second straight day of Trump trampling party orthodoxy after his surreal meeting Wednesday on guns, registered dissent and frustration.