After his sweeping executive order on mail-in voting was blocked nationwide, Donald Trump’s administration pressed the Supreme Court to allow the government to implement new rules that could significantly restrict voters’ access to ballots this fall.

On Tuesday night, a federal judge blocked the U.S. Postal Service from further implementing Trump’s executive order that sought to create a national voter registration list before midterm elections that would be used to decide who is eligible to cast a ballot.

If the Supreme Court doesn’t stop them, the judge’s rulings will “effectively run out the clock” on the administration’s attempts to implement the executive order before November’s elections, “thereby causing irreparable harm to the federal government, the public, and election integrity,” U.S. Solicitor General D. John Sauer wrote to the high court on Wednesday.

In Tuesday’s order, District Judge Indira Talwani rejected the government’s argument that courts cannot rule on the legality of the new Postal Service process until it’s finalized, stating that it would be “prudent” to step in now with “millions of citizens who rely on mail voting” needing “clarity as to how or whether they will vote in November,” she wrote.

Trump’s executive order, even if it hasn’t been implemented, “is thus causing irreparable harm” to states and voting rights groups “ through the confusion it has engendered as to how they may vote in the fast-approaching midterm elections,” Talwani wrote.

Talwani, who was nominated to the bench by Barack Obama, also said the Trump administration has repeatedly “declined to defend the constitutionality” of the executive order.

In March, Trump issued an executive order that would require states to compile lists of eligible voters based on information from his own administration. Those lists would be compiled by the Department of Homeland Security and the Social Security Administration.

The Postal Service would then be blocked from mailing ballots to anyone who did not appear on those lists, and election officials could remove eligible voters from state voter rolls without first getting a chance to see whether they made a mistake.

“The cheating on mail-in voting is legendary,” Trump said during a signing ceremony at the White House earlier this year. “I think this will help a lot with elections.”

Trump has already asked the nation’s high court for help after a federal appeals court upheld a separate decision that warned his executive order will likely disenfranchise “many eligible voters.”

Even a Trump appointee on that three-judge panel agreed that the president’s order could impose “concrete injury” to legal voting.

Trump — who has spent years baselessly insisting that voting by mail is ripe for fraud, and that manipulated ballots were “rigged” against him in elections he lost — is simultaneously demanding the Senate pass his SAVE America Act, which would require proof of citizenship to register to vote, among other restrictions.

Voting rights groups fear the president’s efforts to centralize control over election administration, which is left to the states, is an attempt to boost Republican candidates and suppress Democratic turnout.

Nearly two dozen Democratic-led states, dozens of election officials and more than 50 former state and federal judges have urged the Supreme Court to block Trump’s order, which could spark “chaos” this fall.

“It would be extremely difficult — if not impossible — to obtain a definitive judicial resolution with enough time remaining for states to redesign and reorder their ballot mail, train elections officials, and adequately educate the public before the November midterms,” attorneys general from 22 states and Washington, D.C. warned the court last week.

Talwani’s latest ruling “sends another necessary message to an administration that continues to weaponize portions of the government to sow chaos into our elections at the expense of eligible voters,” according to Sophia Lin Lakin, director of the ACLU’s Voting Rights Project.

“The president does not get to rewrite the rules of voting, and he certainly does not get to treat voters as collateral damage in his campaign to control state-run elections,” she said in a statement.

Trump’s latest legal battle at the Supreme Court follows a wave of litigation from the Department of Justice targeting states over their election rules and voter lists, which the administration is repeatedly failing to collect.

More than 20 federal court rulings have blocked the administration from capturing that data.