The lawsuit is the latest chapter in the long-running saga in the battleground state contest, as Democratic Justice Allison Riggs maintains a 734-vote advantage.
The freshman senator-to-be from Pennsylvania was one of the first Republicans to outline what became the party27;s core strategy against Kamala Harris in the fall.
Brown, who lost re-election in Ohio last month, says he has been approached about running for Democratic National Committee chair and is not ruling out another Senate bid in 2026.
Selzer published a poll days before the election that said Kamala Harris was ahead by 3 percentage points. Trump won the state by 13 percentage points.
In an interview with NBC News, the Pennsylvania senator reflected on his career and said Democrats need to prepare for major fights on taxes and Ukraine.