Elon Musk escalated his public attacks on President Donald Trump Monday, suggesting his administration withheld findings about the federal investigation into Jeffrey Epstein, as their whirlwind friendship continues to devolve into a brutal back-and-forth on their respective social media platforms.

More than a month after their initial social media bluster, Elon Musk has announced the formation of a new U.S. political party in response to U.S. President Donald Trump signing his sweeping tax and spending bill into law.

Tesla stock fell almost 7% in premarket trading on Monday after Musk announced a new political party.Tesla investors are frustrated with his political involvement, wrote analyst Dan Ives.Musk's feud with Trump makes investors worry about Tesla's future,