Elon Musk vowed to launch “America Party” if President Trump’s tax and spending bill passed Congress. Now that the bill has cleared its final hurdle and is heading to Trump’s desk for signature, it remains to be seen whether Musk will keep his promise.

The tech billionaire warned that members of Congress who campaigned on reducing government spending but vote for Trump’s bill “will lose their primary next year if it is the last thing I do on this Earth.