COLUMBUS, Ga. (AP) — A federal judge ordered local election officials in Georgia to allow voting by more than 4,000 people whose eligibility was being challenged ahead of next week’s runoff elections for the U.S. Senate.

U.S. District Judge Leslie Abrams Gardner blocked election boards in Ben Hill County and Muscogee County, which includes Columbus, from forcing large numbers of voters to prove their residency before casting ballots in the runoffs. The judge ruled that denying so many voters access to the ballot so close to an election would likely violate the National Voter Registration Act.

Republican Sens. David Perdue and Kelly Loeffler both face runoff elections next Tuesday. If both lose to Democratic challengers Jon Ossoff and Raphael Warnock, Democrats will take control of the Senate.

Challenges against roughly 4,000 voters in Muscogee County and more than 150 voters in Ben Hill County were part of an effort by the Texas-based conservative group True The Vote to coordinate challenges statewide under a Georgia law that allows any registered voter to challenge the eligibility of any other voter within the same county.

The group said on Dec. 18 that it was bringing challenges in each of Georgia’s 159 counties against more than 364,000 voters whose residency was being questioned based on change of address data obtained from the U.S. Postal Service.

It’s up to local election boards to determine whether the challenges have merit. Several, including in Fulton and Cobb counties in metro Atlanta, have rejected them.

Because election officials in Muscogee and Ben Hill counties had determined the challenges had probable cause, anyone on the challenged list attempting to vote would have been required to prove their eligibility — as would anyone challenged who mailed an absentee ballot.

The judge’s order blocks the counties from impeding voting by anyone who was challenged, saying federal law prohibits “systemic” removal of voters from the rolls within 90 days of an election.

Attorneys for the county election boards had asked Gardner to recuse herself in the case. The judge is the sister of Stacey Abrams, Georgia’s Democratic nominee for governor in 2018 and founder of the voting rights group Fair Fight.

With the Census Bureau days away from likely missing a year-end deadline for turning in numbers used for divvying up congressional seats, President Donald Trump’s administration still hasn’t turned over documents showing how it’s crunching the data on a shortened schedule, according to a coalition of cities and civil rights groups.

Attorneys for cities and civil rights groups that sued the Trump administration over shortening the schedule for the 2020 census said in court papers last week that Department of Justice attorneys have resisted turning over requested documents “at every turn — even when specifically ordered to do so by this Court.”

The lawsuit in federal court in San Jose, California, was originally brought by the coalition to stop the census from ending early out of concerns that a shortened head count would cause minority communities to be undercounted.

The coalition of municipalities and advocacy groups is seeking the documents to help assess how complete and accurate the nation’s once-a-decade head count was. By working toward a year-end deadline, the Census Bureau was giving its statistician only half the time originally planned for crunching the numbers — a timeframe that critics say is too short to do an adequate job, especially given hurdles created by the pandemic.

The census helps determine how many congressional seats each state gets in a process known as apportionment, as well as the distribution of $1.5 trillion in federal spending.

Trump administration attorneys said in court papers that they’ve already turned over large numbers of documents, and the ones they haven’t are not releasable. Releasing them would hinder frank discussions during decision-making if participants feared public disclosure and may violate attorney-client privilege, according to Department of Justice lawyers representing the Census Bureau and the Department of Commerce, which oversees the statistical agency.

“This lack of candor would seriously impair DOC’s and the Census Bureau’s ability to foster the forthright, internal discussions necessary for efficient and proper Executive Branch decision-making related to the Census or on any other matter,” said Megan Heller, a Department of Commerce attorney, in court papers.

The fight over information about how the Census Bureau is analyzing the numbers under a compressed schedule is the latest twist in a lawsuit that already has made one trip to the Supreme Court. The high court’s decision in the lawsuit two months ago allowed the Trump administration to end field operations for the head count in mid-October, two weeks earlier than previously planned.

The coalition says the count was shortened by the Commerce Department so that census data-crunching happened while Trump was still in office in order that his administration can enforce his order to exclude people in the country illegally from the numbers used for determining how many congressional seats each state gets. An influential GOP adviser had advocated doing this in order to advantage Republicans and non-Hispanic whites.

The Supreme Court two weeks ago dismissed a challenge to Trump’s order in a separate lawsuit from New York, saying it was premature. On Monday, the Supreme Court ordered the dismissal of two other lawsuits, and overturned their decisions, in California and Maryland where judges had blocked Trump’s order.

The Supreme Court’s decision is allowing the plan to move forward, but the Census Bureau has admitted discovering data irregularities in recent weeks that put Thursday’s deadline in jeopardy.

If the Census Bureau is unable to turn in the apportionment numbers before President-elect Joe Biden takes office on Jan. 20, it could be a blow to the efforts to exclude people in the country illegal from the apportionment count since the new president is unlikely to pursue it.

When asked this week whether it would meet Thursday’s deadline, the Census Bureau referred to a website that said, “The Census Bureau is working hard to process the data in order to deliver complete and accurate state population counts as close to the December 31, 2020, statutory deadline as possible.”