President Trump on Tuesday announced that he has asked SpaceX founder Elon Musk to “go get” two NASA astronauts who have been aboard the International Space Station since June awaiting a return trip to Earth.

While Suni Williams and Butch Wilmore’s situation is unusual, their return trip will be pretty routine, as they were already slated to fly home on a SpaceX capsule as part of a scheduled crew rotation.

Two NASA astronauts flew to the International Space Station in June on Boeing's Starliner capsule. The test flight was planned for eight days but technical troubles forced the capsule to return empty.