Trump has repeatedly criticised Daniel J. Sullivan's presence on the ballot.

The US Department of Justice has filed a lawsuit seeking to prevent Alaska from certifying its Senate election results if Republican Senator Dan Sullivan loses to Democrat Mary Peltola while another candidate with the same name remains on the ballot. The case could trigger a wider legal battle between the Trump administration and state authorities over the certification of election results, particularly in races where Republicans face a risk of losing seats.

The lawsuit, filed in federal court in Alaska on Thursday, argues that the state must protect the integrity of federal elections. It asks the court to block the certification of a Peltola victory if Daniel J.

“The United States accordingly brings this lawsuit to protect the integrity of the 2026 Senate election in Alaska,” the lawsuit says. Republicans have alleged that Daniel J.

Sullivan is a Democratic plant intended to draw votes away from the incumbent senator. However, he has said he entered the race independently.

Two candidates with the same name on ballotThe Alaska Senate race has attracted attention because its outcome could help determine which party controls the Senate. Dan Sullivan is seeking re-election against Peltola, a former congresswoman.

Daniel J. Sullivan will also appear on the ballot without a party designation, while the senator will be identified as the Republican incumbent.

Alaska's ranked choice voting system allows voters to rank candidates in order of preference, meaning voters confused by the two names could select both. The Alaska Supreme Court has already rejected an earlier Republican attempt to remove Daniel J.

Sullivan from the ballot. Republican officials in the state also made the decisions about how the two candidates would be listed.

Neither the senator's campaign nor Daniel J. Sullivan immediately responded to requests for comment.

The Trump administration has increasingly used the Justice Department to pursue legal action against political opponents and Democratic-controlled states ahead of elections. Democrats and voting rights advocates have warned that the administration could try to prevent the certification of results in races lost by Trump's party, drawing comparisons with the president's unsuccessful attempts to overturn his 2020 defeat to Joe Biden.