The Independent Alliance includes four other independent MPs who all beat Labour candidates over the party's position on Gaza. Corbyn confirmed discussions were under way among the group.
Musk criticized Trump's tax cuts and spending bill, calling it "political suicide" and described the GOP as the "Porky Pig party." He threatened to form a new political party, the "America Party," if the bill passed.
The controversial, 1,000-page bill passed by a 51-50 margin, using a tie-breaking vote from Vice President JD Vance, and will now go back to the House of Representatives for a final vote.