Updated 6:05 p.m. Eastern with Bridenstine comments.
The first manned mission to space from US soil since 2011 has been scrubbed at the last minute due to inclement weather, ending a day of excitement for NASA, SpaceX, and a public eager to see crewed spaceflight return to America.
SpaceX will try to re-launch Falcon 9 on Saturday.
"We see such attempts, we consider them unacceptable and we will hinder this to the greatest extent possible", he said, adding that Russian Federation is readying a response and that worldwide regulations ban the deployment of any weapon into space. "That's just part of the deal".
The next launch window is scheduled for Saturday at 3:22 pm ET.
Although the Crew Dragon capsules incorporate numerous upgrades, one in particular acquire the most attention - its toilet. Late Tuesday, the odds of acceptable launch weather improved to 60 per cent.
The last time astronauts launched from Florida was on NASA's final space shuttle flight in July 2011.
Depending on weather conditions, it should be easy to catch over the UK, Adrian says. The Air Force's 45 Space Wing is forecasting a 40 percent chance that the weather violates launch safety guidelines on Saturday, May 30.
Also, in a video snap posted on Twitter, NASA Administrator Jim Bridenstine said "there was just too much electricity in the atmosphere", that could trigger lightning if the launch pushed through. "But this has been your baby". Musk responded with a tweet that simply said "No problem". "In fact, I've told my team: It's not simply the top priority, it is the only priority".
SpaceX and NASA had to postpone their highly anticipated spaceflight as rain continuously poured around the launchpad.
NASA canceled the launch 16 minutes before takeoff because of the threat of lightning near the Kennedy Space Center in Florida.
Update: We're continuing to provide live updates on how to watch the Space X launch, offering weather update to determine if it can launch (they're cutting it close right now) and filling you in on everything you missed in the live stream.
The astronauts, meanwhile, could not immediately leave the capsule after the scrub, having instead to wait for propellants to be offloaded from the rocket so that crews could return to the pad.