Elon Musk is pressing NASA to abandon its planned journeys to the moon – projects that have been decades in the making, with billions already spent and contracts already signed.

Despite backlash from NASA insiders and politicians on both sides of Congress – who view his plans as costly, disruptive and politically toxic – Musk remains resolute.

Donald Trump wants to write the next chapter in US spaceflight history by landing the first humans on Mars before he leaves office. The announcement mirrors Elon Musk’s own push to reach Mars – and comes as key SpaceX officials gain power at NASA amid budget and staff cuts at the agency.

Today, Wall Street Journal reporter Emily Glazer, on Elon Musk’s plan to take over NASA.