Andretti Cadillac, led by former F1 driver Michael Andretti and his father, 1978 champion Mario, disagreed with F1's rejection of its bid to join the championship from either 2025 or 2026. The rejection by Liberty Media's Formula 1 was due to opposition from existing teams over concerns of diluted prize money and beliefs that the team would not add value or competitiveness. Despite allegations of not providing sufficient evidence of being able to build a second car, Andretti Cadillac remains committed to placing an American team in F1 and has made significant progress on its car and engine. The team plans to integrate a General Motors' engine by 2028, with F1 leaving the door open for their entry in that year.