Let's start with the Iran deal. The Wall Street Journal reported this month that $400 million in cash arrived in Iran just as the Iranians were releasing Americans they had detained. Republicans in Congress are now following up. On Aug. 12, Sens. Mike Lee and Ted Cruz wrote a scathing letter to Obama asking him whether the payment to Iran violated U.S. prohibitions against financial interactions with Iran. This is the kind of fodder that a typical Republican presidential campaign would seize upon. Trump's campaign doesn't even seem to be trying.