In a letter led by Sen. Amy Klobuchar, chair of the Senate antitrust panel, six senators argued F1 management may be violating antitrust law, escalating an ongoing clash.

The six senators said they are “concerned” that F1 may be acting on behalf of other teams, “including foreign automakers,” to deny Andretti’s bid to enter the sport in 2025 or 2026 even though its governing body, the FIA, approved its application. Formula 1 management, the commercial side of the sport, rejected its bid in January, doubting the team would be competitive or increase the value of the championship.