The Democratic National Committee sued the Trump administration Thursday over a Pentagon move that eliminated a key checkbox on the postcard used by overseas Americans to register to vote — a change that could block thousands of U.S. citizens who have never set foot in the country from casting ballots this November.

The stakes are straightforward: both parties are scrambling over a small but potentially decisive slice of the electorate, and the DNC is mounting a legal fight for voters abroad that it has never matched when it comes to securing basic integrity measures for citizens voting at home.

At issue is the Federal Post Card Application, or FPCA, which the Department of Defense administers. Since 2013, the form included a box for U.S. citizens who have never lived in the United States to acknowledge their citizenship and request a ballot. Thirty-eight states and the District of Columbia allow such voters — typically children of U.S. citizens born overseas — to vote in at least some elections, provided they have close family connections to the state.

In August, with the election less than 90 days away, the Pentagon submitted two emergency requests to the Office of Management and Budget to modify the form. Among the changes: eliminating that checkbox. Sean O'Keefe, the deputy under-secretary of war for personnel and readiness, wrote in an August letter to OMB that the existing form "may confuse voters about the information they are required to provide under federal law." He said the normal rulemaking process couldn't be used because of the approaching election deadline.

The DNC's lawsuit calls that justification pretextual. "These American citizens pay U.S. federal and state taxes, but now a years-old plan has culminated in a manufactured 'emergency' to justify impeding their right to vote in American elections and potentially disenfranchising them entirely," the complaint states.

DNC chair Ken Martin went further, framing it as a raw power play: "They know that Americans, both at home and abroad, are going to reject their destructive agenda, and they are scrambling to disenfranchise as much of the electorate as possible by any means necessary."

The New York Post noted the political backdrop: Democratic-leaning civilians overseas have out-voted Republican-leaning military members in recent years, and the GOP has started targeting the law that guarantees both groups ballot access — the Uniformed and Overseas Citizens Absentee Voting Act, or UOCAVA. Republicans won a court case blocking overseas citizens who never lived in North Carolina from voting there, but have not yet succeeded in swing-state Michigan.

The Post also noted that Secretary of Defense Pete Hegseth has urged service members to cast ballots en masse, implying they could out-vote Democratic strongholds like Detroit.

Susan Dzieduszycka-Suinat, president of the U.S. Vote Foundation, warned the change will confuse eligible voters who now won't see the box they're used to checking. "If this works in slicing off a piece of the electorate," she told the Post, "wait until the next emergency."

A DNC official, speaking anonymously, said the remaining options on the form don't fit voters who have never lived in the U.S., and requiring them to sign under penalty of perjury on a form with no accurate box could discourage registration entirely.

The number of affected voters is small but not trivial: an estimated 11,500 Americans who had never lived in the U.S. cast ballots in 2016, and the lawsuit contends that number has likely grown.

The Pentagon did not respond to requests for comment from either outlet.

What remains unaddressed in either the DNC's lawsuit or its public statements is the obvious question: if the party is willing to go to federal court over the voting rights of citizens who have never resided in a single American town, why has it consistently opposed even modest domestic integrity measures — voter ID, signature verification, citizenship confirmation — for Americans who live and work here every day?