Elon Musk’s feud with President Donald Trump has reignited, with the tech billionaire threatening to launch a new political party and Trump suggesting Musk could be punished for his opposition.

Musk has taken issue with the bill saying that it flies in the face of everything he thought he was supporting. Trump appointed Musk to head up the newly formed Department of Government Efficiency and was tasked with reducing “waste, fraud, and abuse” in government spending.

The billionaire and former Trump adviser suggested that if the domestic policy bill passed, he would swiftly form a new “America Party” and back primary challenges to Republicans.