https://www.wired.com/story/whats-next-for-spacexs-crewed-mission-to-the-iss/

On Wednesday, NASA astronauts Bob Behnken and Doug Hurley were supposed to launch to the International Space Station in SpaceX’s Crew Dragon capsule. It would have been the first crewed launch from the US in nearly 9 years and the first time that a company launched NASA astronauts on its own rocket. The event was accompanied by the pomp one might expect from such a historic occasion: Kelly Clarkson sang the national anthem remotely from her Montana ranch via NASA’s livestream, Elon Musk held court in the mission firing room, and President Donald Trump flew in from Washington DC to deliver a congratulatory speech. But just 17 minutes before liftoff, the mission was scrubbed due to concerns of lightning activity near the launchpad.

Last-minute cancellations are normal in the rocket business, and—with two lives on the line—SpaceX and NASA are being extra cautious for the Demo-2 mission. Although everything functioned perfectly on the rocket and inside the crew capsule, weather conditions along the flightpath fell outside of NASA’s exacting requirements for launch. (The main concern was the possibility of lightning striking the rocket, but the height of the cumulus clouds around the launch site also posed problems.) So on Saturday afternoon, Behnken and Hurley will head to the launchpad to try it all over again, Musk will return to the firing room, and even Trump will return to Florida to give a speech.