New Delhi, July 18 -- WASHINGTON - The federal government has identified what it says are 250,000 voter-registration records belonging to noncitizens in California, New Jersey, Nevada, and Pennsylvania. On Friday, the man in charge of the Department of Homeland Security told state election officials that choosing to do nothing about it could land them in prison.

DHS Secretary Markwayne Mullin, appearing before reporters, said the Trump administration would condition federal election grants on state participation in its election-security program and threatened prosecution for officials who ignore the data the department has provided. "If the election officials, once we gave them the information they need to secure their elections and they...