Elon Musk vows to defeat Republicans who back Trump's megabill 'if it is the last thing I do'

Kevin Dietsch/Getty Images Elon Musk is threatening to defeat Republicans who vote for Trump's megabill. "They will lose their primary next year if it is the last thing I do on this Earth," he wrote. Musk previously said he would scale back his political spending. Elon Musk is back on a tear…