June 18 (UPI) -- Officials for NASA, Axiom Space and SpaceX will attempt to launch the Axiom-4 mission as soon as Sunday after a Falcon 9 rocket leak scrubbed the June 11 mission launch. The Axiom-4 mission on June 22 would be the fourth private astronaut mission to the International Space Station, according to NASA . NASA officials have been evaluating ISS operations following a recent repair service to the aft-most segment of the ISS's Zvezda service module. A liquid oxygen leak caused SpaceX