Elon Musk has turned his back on Donald Trump and launched the America Party, vowing to fight what he calls ruinous spending. Once Trump’s top campaign donor, Musk says the president’s new tax and spending bill will bankrupt the United States. The tech billionaire, who funded Trump’s re-election and ran a government efficiency unit, now promises to unseat lawmakers who back the plan. So far, there’s no official paperwork — and the White House remains silent.