We appear to be entering a new era, in which political desperation at home leads to increasingly unhinged threats abroad

Donald Trump was in Nebraska on Monday, and though his long rally speech had elements of a performance, this was no Bruce Springsteen album. He offered another dark meditation on a world spiraling out of control, one in which the destruction of American cities is increasingly a possibility, unless Americans trust him to use the vast powers of the presidency to annihilate his foes.

The president drew fury when he suggested that Iran could launch a nuclear attack and “take out” Los Angeles or San Diego. California leaders reacted with scorn at Trump’s alarmism.

Ted Widmer, a former White House speechwriter, is the editor of American Speeches, and the recently published The Living Declaration: A Biography of America’s Founding Text, both published by the Library of America