Voting twice? Trump creates a new headache for election officials.

By encouraging North Carolina voters to test the integrity of the elections system by casting both mail and in-person ballots, and repeating some of the same claims in a series of tweets and a speech Thursday, President Donald Trump seemed to mimic a cynical slogan originating in 20th-century machine politics: Vote early and often.Indeed, Trump’s repeated statements suggesting that the nation’s elections system is riddled with fraud fit a historical pattern — politicians in the