The Postal Service proposed a new rule pushing states to turn over their mail-in and absentee voter rolls to the agency, a move in line with President Donald Trump’s March executive order tightening regulations on mail-in voting in federal elections.

Since the start of his second administration, Trump has made election integrity and security a central issue, signing multiple executive orders to require proof of citizenship and crack down on mail-in voting fraud, essentially establishing a national voter verification system. His efforts have run into several legal hurdles, with judges ruling against requirements for proof of citizenship as Trump’s appeal pends, and several Democratic states sue over the mail-in voting order.