WASHINGTON (AP) — Mob rule. A socialist takeover. Terrorists marching on the U.S. border.

As President Donald Trump embraces the role of electoral boogeyman, he's making closing arguments to midterm voters that increasingly resemble a Halloween horror story.

The candidate who won the White House in part by harnessing many Americans' anxieties is offering dire warnings about what life would look like if Democrats gain control of Congress.

Using racially charged language and sometimes questionable information, Trump argues that Democrats will plunge the country into socialism, imperil the social...