Trump wants voters to prove citizenship. Arizona tried that and bungled it.

The state requires voters to prove their citizenship. An error led to chaos, suspicion and confusion, signaling broader challenges for Republican-led efforts across the country.PHOENIX — For 30 years, no one questioned Danny Dobosz’s citizenship when the lifelong Republican cast his ballot. So when a letter arrived from a local election official last month asking him to send back a copy of his birth certificate to prove he was an American citizen who was eligible to vote, he tossed it in the trash at his home in Yuma, Arizona. Dobosz, an ardent supporter of President Donald Trump who was born...