HOUSTON — A federal judge on Monday rejected another last-ditch Republican effort to invalidate nearly 127,000 votes in Houston because the ballots were cast at drive-thru polling centers established during the pandemic.

The lawsuit was brought by conservative Texas activists who have railed against expanded voting access in Harris County, where a record 1.4 million early votes have already been cast. The county is the nation’s third-largest and a crucial battleground in Texas, where President  Trump and Republicans are bracing for the closest election in decades on Tuesday.

U.S. District Judge Andrew Hanen’s decision to hear arguments on the brink of Election Day drew concern from voting rights activists, and came after the Texas Supreme Court rejected a nearly identical challenge over the weekend.

The ruling came in response to a lawsuit by conservative Republican activists who have filed a battery of court challenges over moves to expand voting options during the COVID-19 pandemic. The challenges have not involved Trump’s campaign.

Demonstrator Gina Dusterhoft holds up a sign as she walks to join others standing across the street from the federal courthouse in Houston on Monday before a hearing in federal court involving drive-thru ballots cast in Harris County. The lawsuit was brought by conservative Texas activists, who have railed against expanded voting access in Harris County, in an effort to invalidate nearly 127,000 votes in Houston because the ballots were cast at drive-thru polling centers established during the pandemic. David J. Phillip/Associated Press

Another 20,000 or more voters were expected to use drive-thru polling locations Tuesday, said Harris County Clerk Chris Hollins, the county’s top elections official. Several voters who already used the drive-thru centers rushed to join mounting opposition to the lawsuit, including a Houston attorney whose wife was 35 weeks pregnant when she cast her ballot. She gave birth to twins Friday.

“My vote counts,” David Hobbs said. “My wife’s vote counts.”

Trump won Texas by nine points in 2016 but polls have shown Democrat Joe Biden still within reach in America’s biggest red state. Democrats also need to flip only nine seats to reclaim a majority in the Texas House for the first time in 20 years, and have aggressively targeted several races in Harris County.

Harris County offered 10 drive-thru locations as an option for its nearly 5 million residents amid worries of spreading the coronavirus. Jared Woodfill, a former chairman of the Harris County Republican, argued that Texas election law makes no explicit allowances for drive-thru voting and framed it is as an unlawful expansion of curbside voting, which is legal in Texas but limited to people who are unable to enter polling places because of their health.

Portions of the hearing were consumed by debate over what exactly qualified as a legal structure for a polling place under Texas law.

“You have a fundamental right to vote in a car?” Hanen tersely asked an attorney for the ACLU.

Woodfill’s lawsuit noted that all but one of the drive-thru centers were set up “in Democrat areas of the county.” More than 40 percent of Harris County residents are Latino, and about one in five residents are Black.

The lawsuit drew objections even from Republicans, include former Texas House Speaker Joe Straus. Republican Sen. John Cornyn, who is facing the toughest reelection battle of his career Tuesday against Democrat MJ Hegar, also said during a weekend campaign stop that the Texas Supreme Court made the right decision earlier in rejecting an identical challenge.

The Texas Supreme Court, which is controlled entirely by Republicans, rejected an identical lawsuit last month and on Sunday refused to invalidate the votes already cast. The state’s highest court did not explain its decision.

Hollins had asked Republican Gov. Greg Abbott to affirm that the drive-thru locations are legal but received no response.

Texas is one of just five states that did not allow for widespread mail-in voting this year during the coronavirus pandemic, which has killed more than 18,000 people statewide. Abbott instead expanded early voting by one week, and that extra time helped Texas already surpass 2016’s total votes even before Tuesday’s election.

More than 9.7 million people have cast early ballots in Texas, where turnout typically ranks among the lowest in the country. Some elections experts predict that total turnout in Texas could surpass 12 million, and Harris County officials have taken more steps than most to expand voting access.

The county tripled the number of polling places and last week had eight locations that stayed open for 24 hours.

Associated Press writer Paul J. Weber in Austin, Texas, and Jake Bleiberg in Dallas contributed to this report.