Commentators in the print and video media often complain about President Donald Trump’s aggressive actions regarding immigration, tariffs, health care, climate change, guns, the Iran nuclear agreement, and other controversial topics, but they recognize that he won the election. Reluctantly, they acknowledge that Trump has a mandate to take strong positions on the issues. But they are wrong. Donald Trump does not possess impressive authority to move the nation dramatically in new directions. Pundits and politicians should refrain from treating the 2016 election as evidence of public approval for extraordinary exercises in presidential power. In many respects, Trump is a...