President Donald Trump joked during a live-streamed press conference with astronauts on the International Space Station Monday that he wouldn’t want to personally re-use human waste, as astronauts do during their time in outer space.During the call between the White House and NASA astronauts Peggy Whitson and Colonel Jack Fischer, Trump asked Whitson, “what are we learning by being in space?”Whitson explained that astronauts were learning how to reuse materials to continue making oxygen, water and other resources needed for long-duration missions.