Trump voter in key swing district is horrified by his immigration crackdown. ‘We’re not a Third World country. What the hell is going on?’

Like many Donald Trump voters, Miranda Niedermeier is not opposed to immigration enforcement. She was heartened by initial moves from the Republican president in his second term that she saw as targeting immigrants who were in the United States illegally and had committed crimes.

But Niedermeier, 35, has steadily become disillusioned with Trump. Never more so than in recent weeks, when federal immigration officers killed two U.S. citizens during Trump’scrackdownin Minneapolis.

“In the beginning...