The high court lifted an injunction that had blocked the order in 23 states that challenged it after the administration appealed in July. The U.S. Postal Service and Justice Department said they would immediately implement the revised mail-ballot restrictions after the ruling. Most immediately, the ruling clears the path for the U.S. Postal Service to check its distribution of mail-in ballots against a list of citizens maintained by the Department of Homeland Security. But it’s also a significant political victory for the Trump administration as it has advocated against the widespread use of mail-in-voting, citing what it believes is a...