President Trump is weighing powerful arguments from both sides.President Donald Trump is facing a serious dilemma regarding Israel and Iran. He stands for three things that may soon come into direct conflict with each other. He is, above all, America-First, but he is also a self-proclaimed crusader for peace and a transactional, pragmatic chief executive. That first identifying trait suggests Trump will protect American interests at all costs, eschewing the nation-building of previous presidents. The second translates to avoiding another foreign war, this time in Iran. The third calls for a pragmatic, realistic assessment of Iran’s ongoing threat to US...