The crew-swap mission will enable NASA’s Butch Wilmore and Suni Williams to return to Earth from the International Space Station.

Williams, Wilmore, fellow Nasa astronaut Nick Hague and Russian cosmonaut Alexandr Gorbunov — a quartet called Crew-9 — are scheduled to use the Dragon capsule to return to Earth after a 'handover' exercise.

NASA astronaut Butch Wilmore recently said that politics has nothing to do with why he and his crewmate, Suni Williams, are still in space.