President Donald Trump on Tuesday endorsed former Navy SEAL Ed Gallrein in the race for Kentucky’s 4th Congressional District, the seat currently held by Republican Rep. Thomas Massie.

Trump announced his support on social media, throwing his backing behind Gallrein as a potential successor to Massie, who has frequently clashed with the president in recent months.

The endorsement comes amid an ongoing dispute between Trump and Massie over the handling of documents related to convicted sex offender Jeffrey Epstein. Massie has repeatedly pushed for the public release of files connected to the investigation and has criticized the administration’s response to the issue.

Trump has responded by publicly rebuking Massie, including in his endorsement message supporting Gallrein’s candidacy. The president has previously accused Massie of undermining his agenda and has signaled openness to backing challengers against Republicans who oppose him.

Kentucky’s 4th Congressional District is considered strongly Republican, meaning the GOP primary will likely determine the eventual winner of the seat. Trump’s endorsement could play a significant role in shaping the race as Gallrein attempts to unseat the incumbent lawmaker.