Rep. Lou Barletta, R-Pa., is running for Democratic Sen. Bob Casey's seat in Pennsylvania.
Barletta announced he was entering the GOP primary for the seat in a video posted on his campaign website on Tuesday.
"I've decided to run for the United States Senate," he said. "Our campaign will be supported by patriots like you."
Barletta was an early supporter of President Donald Trump, The Hill said.
The primary already includes two Republican state representatives and two others, according to the Pittsburgh Post-Gazette.
Meanwhile, The Hill noted the Pennsylvania Democratic Party has filed an ethics complaint against Barletta. The party claims he misused official resources during talks of a potential run for Casey's seat.
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