Test pilots Doug Hurley and Bob Behnken rode the SpaceX Dragon capsule back to Earth.
The Dragon spacecraft carrying Doug Hurley and Bob Behnken docked automatically and required no assistance.
He threatened protesters, saying that "mob violence" would be stopped "cold."
Bob Behnken and Doug Hurley, aboard the Crew Dragon, are the first Americans to blast off into space from U.S. soil in nearly a decade.
A presidential visit can also put pressure on NASA managers to launch in iffy conditions. No president has ever attended a "first" launch of a crewed spacecraft.
It's set to be the first launch of Americans from the U.S. in nearly a decade.
The state's department of public health weighed in on the name the SpaceX CEO and Grimes chose for their son.
The actor would use Musk's SpaceX rocket in the project, which is in the "early stages of liftoff," according to Deadline.
SpaceX said the mission was one of its most challenging launches.