Donald Trump slams Elon Musk's plan for rival party as feud deepens

Donald Trump criticised Elon Musk's plan to launch a new political party. Trump stated third parties have never succeeded in the US. Musk announced the formation of the "America Party" after Trump signed a tax bill. This move signals Musk's deeper involvement in politics. Tesla investors are concerned about Musk's focus. Tesla's stock price declined following the announcement.