By CHRIS MEGERIAN WASHINGTON (AP) — President-elect Donald Trump delivered a likely death blow to bipartisan congressional budget negotiations on Wednesday, rejecting the measure as full of giveaways to Democrats after billionaire ally Elon Musk whipped up outrage toward the bill and cheered on Republican lawmakers who announced their opposition. Trump’s joint statement with Vice President-elect JD Vance, which stopped the bill in its tracks, punctuated a daylong torrent of social media posts by Musk attacking the legislation for what he described as excessive spending. “Stop the steal of your tax dollars!” Musk wrote on his social media platform X as he dangled primary challenges against anyone who voted for the budget deal, a threat Trump later echoed in a post of his own. The episode showcased the growing political influence of Musk, whom Trump has selected alongside entrepreneur Vivek Ramaswamy to spearhead the Department of Government Efficiency, a nongovernmental task force formed to find ways to fire federal workers, cut programs and reduce regulations. Rep.