Elon Musk was expected on Tuesday to present an update on SpaceX's plan to launch missions to Mars ahead of a high-stakes Starship test flight later in the day. Musk, the world's richest person and a key supporter of U.

SpaceX launched its mega rocket Starship again on Tuesday evening in hopes of making it through the entire test flight.

Musk, who spent nearly $300 million to back Donald Trump's presidential campaign and other Republicans last year, also said he was committed to staying on as Tesla's CEO for another five years.