Gerald Seib @ The Wall Street Journal

With Bolton’s Exit, GOP Interventionism Gives Way to Trump

Longtime Republican thinking on national security, which embraces American intervention abroad and is comfortable with military action, just collided with Trumpian thinking on national security, which is dubious of intervention abroad and deeply skeptical of foreign wars.

Not surprisingly, Trumpian thinking has prevailed.

In a nutshell, that is the story of the abrupt departure of John Bolton as President Trump’s national security adviser Tuesday. Obviously, Mr. Bolton’s departure roils the Trump national-security team once again.

More important, though, the Bolton exit represents something far broader: It underscores a significant turn in Republican national-security philosophy, as least as Mr. Trump envisions it today.