In preparation for Saturday's flight, SpaceX sent up a Dragon capsule with only a test dummy aboard a year ago, and it docked smoothly at the orbiting outpost on autopilot, then returned to Earth in a splashdown. "There's a lot of work to do".
The spacecraft had to perform a series of manoeuvres to raise its obit to come close enough to dock at the space station.
The New York Times reports they'll be tasked with helping U.S. astronaut Christopher Cassidy, who is already on the ISS after hitching a ride on a Russian Soyuz spacecraft.
The first time around, Trump and other family members including his wife, Melania Trump, flew down from Washington for a launch attempt that ended up being scrubbed due to weather concerns.
Russian Federation has lost its long-held monopoly as the only country able to ferry astronauts to the International Space Station following the flawless manned launch by USA company SpaceX.
Trump, who observed the launch, said the United States had regained its place as the world's leader in space, that USA astronauts would soon land on Mars, and that Washington would soon have "the greatest weapons ever imagined in history".
A Look At The Latest Updates In Hong Kong
It was the "firm determination of all Chinese people" to oppose interference in Hong Kong affairs by any external forces, the paper said.
"Welcome to Bob and Doug", said Mr Bridenstine. "When I first came into office, three and a half years ago, NASA had lost its way, and the excitement, energy and ambition, as nearly everybody in this room knows, was gone", Trump said.
"Let's light this candle", Hurley said just before ignition, borrowing the words used by Alan Shepard on America's first human spaceflight, in 1961.
"I really think it's a demonstration of the trust they had both in the NASA team and the SpaceX team to get them safely to orbit", he said.
While a monumental achievement for NASA and SpaceX, which was founded in 2002 and has very public ambitions of one day launching crewed missions all the way to Mars, there remains some ways to go before Demo-2 is hailed a total success. During the mission, the crew and SpaceX mission controllers will verify the performance of the spacecraft's environmental control system, displays and control system, maneuvering thrusters, autonomous docking capability, and more. NASA officials estimate they'll remain on the ISS for at least a month, though they could be returning to Earth as late as September.
If that wasn't enough to get them going, once they were in route to the International Space Station, the crew woke up to Black Sabbath's "Planet Caravan" jamming along in space prior to docking. "We designed it to be two-fault tolerant, which means that any two things could fail, so I could lose a flight computer and a thruster and I could still bring the crew home safely".
NASA's Commercial Crew Program is working with SpaceX and Boeing to design, build, test and operate safe, reliable and cost-effective human transportation systems to low-Earth orbit. The Soviet Union kicked off the space race by becoming the first nation in the world to send a man-made satellite, Sputnik 1, into outer space in 1957. Instead of owning and operating the spacecraft itself, Bridenstine said, the future of the agency will lie with partnering with the growing commercial space sector, as it has with SpaceX.