As billionaire Elon Musk feuds with President Trump over his signature tax and domestic policy legislation, Musk has reupped his calls to launch a new political party — a daunting task even for the wealthiest person on Earth. Musk first floated launching a third party, dubbed the "America Party," earlier this month, part of a nasty back-and-forth between the president and the Tesla CEO that marked the likely end of their political alliance. Musk raised the idea again this week as lawmakers raced to send the One Big Beautiful Bill Act to Mr. Trump's desk — and this time, Musk...