President Donald Trumptook aim atElon Muskafter his former adviserannounced the creation of new political partyfollowing staunch opposition to the president's signature legislation. "I am saddened to watchElon Muskgo completely "off the rails," essentially becoming a TRAIN WRECK over the past five weeks," Trump wrote on social media July 6. "He even wants to start a Third Political Party, despite the fact that they have never succeeded in the United States." Muskannounced the formationof the "America Party" on July 5, the day after Trump signed his mega-bill. The nonpartisan Congressional Budget Office projects the legislation will increase the national debt by $3.4 trillion, which Musk as lambasted. "When it comes to bankrupting our country with waste & graft, we live in a one-party system, not a democracy,"Musk wrote on his social media platform X on July 5. "Today, the America Party is formed to give you back your freedom." Trump criticized third parties in his July 6 post. "The one thing Third Parties are good for is the creation of Complete and Total DISRUPTION & CHAOS, and we have enough of that with the Radical Left Democrats," Trump wrote. Musk − the world's richest person with a worth of $405 billion,according to Forbes−spent nearly $290 millionto help Trump and other Republicans get elected. In the opening months of Trump's presidency, Musk led the effort to slash federal agencies through the Department of Government Efficiency. The two havefeuded in recent weeksas Musk strongly criticized Trump's "Big Beautiful Bill," which includes tax cuts, increased spending on immigration enforcement andthe militaryand deep spending cuts in Medicaid. The bill increases the debt ceiling by $5 trillion. Musk has threatened to boost primary challengers against those who supported the bill, which included all but two Republicans in the House and three in the Senate. "Every member of Congress who campaigned on reducing government spending and then immediately voted for the biggest debt increase in history should hang their head in shame!"Musk wrotebefore Trump signed the legislation. "And they will lose their primary next year if it is the last thing I do on this Earth." Muskhad taken steps to repair his strained relationshipwith the president ‒ including personally apologizing for insults he made during hiscombative exit from the Trump administration last month- before the new round of sparring. Musk's announcement of a new political party comes after he suggested in Maythat he would cease his political spendingas he shifts his attention back to his companies Tesla and SpaceX. This article originally appeared on USA TODAY:Donald Trump slams Elon Musk after "America Party" announcement