A federal judge has blocked the Trump administration from enforcing part of an executive order he signed last year that would require proof of citizenship as a requirement to vote in elections. In an order issued Wednesday, U.S. District Judge Denise L. Casper wrote that federal law and the Constitution do not give power to a president to manage elections. “Our Constitution vests control over federal elections in the States, subject to some oversight by Congress,” Casper, who serves in the U.S. District Court for the District of Massachusetts, wrote in the order. “While the Constitution vests the President with ‘executive power’ and commands him to ‘take Care that the Laws be faithfully executed,’ it does not grant the President any specific powers over elections.”...