Six Texas voters are suing the state, claiming its law allowing anyone over 65 to vote by mail regardless of their personal circumstances discriminates against young voters.

The lawsuit, filed Wednesday in U.S. district court in San Antonio, argues that the restriction violates the 26th Amendment, which states that the right of anyone 18 and over to vote can’t be “denied or abridged.”

It is the latest in a series of legal battles Democrats have sparked in Texas seeking to expand voting rights leading up to the November general election. Most recently, with the pandemic threatening to curb in-person turnout, the suits have honed in on vote-by-mail accessibility.

Under the law, voters under 65 may only vote absentee if they meet certain criteria, such as if they will be absent from the county where they are registered to vote for the entirety of election day, are confined in jail but otherwise eligible to vote or have a sickness or physical condition preventing them from voting in person. Fewer than 7 percent of Texas voters mailed in ballots in 2018.

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“Having opted to make mail-in voting an option for voters in Texas, Defendants may not constitutionally choose to restrict access to the franchise to voters for no other reason than the fact that they are 18 years old, 25 years old, or 64-and-a-half years old. Period,” the suit states.

The voters are represented by the National Redistricting Foundation, an affiliate of the National Democratic Redistricting Committee and whose chair is former U.S. Attorney General Eric Holder. They argue that this issue will be exacerbated by the ongoing pandemic.

“While the absentee ballot age restriction would be unconstitutional under any event, in the current circumstances its application is unconscionable,” it states, adding that the rule will “force millions of voters into an untenable position, choosing whether to forego their most fundamental right or having no choice but to vote in person, at what are likely to be understaffed and overcrowded polling places, putting their own health at risk, and needlessly exacerbating the spread of the virus.”

Earlier this month, a state district court judge in Austin sided in favor of Democrats and civil rights groups in their suit aiming to allow voters to qualify as having a disability and vote by mail if they are concerned about catching coronavirus at the polling place, though the case is far from over and headed for appeal.

Around the same time that the state district judge ruled, Republican Attorney General Ken Paxton issued a legal advice letter saying fear of the coronavirus is not an acceptable excuse to claim disability to vote by mail and warning that such requests could lead to criminal charges.

“Mail ballots based on disability are specifically reserved for those who are legitimately ill and cannot vote in-person without needing assistance or jeopardizing their health,” Paxton said.

The Texas Democratic Party also filed a similar suit in federal court. On Wednesday, the party amended its suit and requested a preliminary injunction to force the state to allow any Texan to receive a mail-in ballot prior to the July 14 primary runoff, saying Paxton’s letter had caused confusion.