Two NASA officials have weighed in on the public dispute over when and how to bring home Butch Wilmore and Suni Williams, who have been on the International Space Station since June.

Squinting in the sun with Elon Musk, Trump stood next to five Tesla vehicles, holding a piece of paper with handwritten notes about their features and costs. Trump said he would purchase a car himself at full price.

Elon Musk has faced "great difficulty" running his companies while trying to remake the US government. Some observers worry he's taken on too much.

A launch pad problem has prompted SpaceX to delay a flight to the International Space Station to replace Nasa's two stranded astronauts.

In an interview with our columnist the mogul is open, honest, transparent, and committed to preventing this country from falling deeper into