This editorial in the WSJ says Europe should plan for expanding its role in defense, because the U.S voters in the primaries for both political parties appear to be calling for less U.S. engagement in the world. It says Trump, Sanders, and Clinton voters are moving towards less engagement, and calling for the U.S. to spend less in overseas engagements, more at home. It points out that only Britain, Estonia, Greece, Poland and the U.S. spend the 2% of GDP on defense that is considered a requirement for NATO membership.