The ruling was the sixth time in recent months that federal courts rejected unfair voter restrictions enacted by Republican-controlled legislatures in thinly veiled attempts at voter suppression timed for the presidential election.

Last Friday, a federal appeals court struck down the heart of a new North Carolina voting law found to block African-American voters with what it called “almost surgical precision” just as the black vote has been growing in power in that important swing state. In Texas, a federal court struck down elaborate ID requirements as unconstitutional, freeing more than 600,000 Latinos and blacks to vote this November. Other rulings have ordered retreats from blatantly unfair restrictions in Wisconsin, Kansas and Ohio. More lawsuits are in the courts, brought by minorities and voting rights defenders complaining that the laws interfere with voters who are thought to favor Democrats.

As the courts remove these crude hurdles one after another, Donald Trump has begun complaining that his presidential campaign may be facing a “rigged” outcome. Studies have established that fraud is a minuscule factor in American elections. But Mr. Trump told The Washington Post this week, “If you don’t have voter ID, you can just keep voting and voting and voting.”

In truth, the recent court decisions help “un-rig” the election by rejecting shamefully partisan strictures. In the North Dakota ruling, the judge found that more than 3,800 Native Americans could have been denied the vote in November in part because the Legislature’s new restrictions required specific residential addresses on ID documents — an obvious rebuff to the Indian reservation culture of using postal boxes for mail. This is the level of malicious voter suppression to which Republican statehouses have been stooping.