NASA astronaut Douglas Hurley waves as he heads to Pad39A before the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft at the Kennedy Space Center, in Cape Canaveral, Florida, U.S., May 30, 2020.

Elon Musk's brother Kimbal Musk applauds to him at a briefing after the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

The SpaceX Crew Dragon spacecraft sits atop a Falcon 9 booster rocket on Pad39A at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 29, 2020.

NASA astronauts Douglas Hurley and Robert Behnken head to launch pad 39 to board a SpaceX Falcon 9 rocket for a second launch attempt on NASA?s SpaceX Demo-2 mission to the International Space Station from NASA?s Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump and U.S. Vice President Mike Pence watch the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft, from Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump and Elon Musk are seen at the Firing Room Four after the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People view the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

NASA astronaut Douglas Hurley's wife Karen Nyberg and their son say goodbye before the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft at the Kennedy Space Center, in Cape Canaveral, Florida, U.S., May 30, 2020.

A count down clock is shown in front of Pad 39A before the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft at the Kennedy Space Center, in Cape Canaveral, Florida, U.S., May 30, 2020.

A SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA astronauts Douglas Hurley and Robert Behnken launches NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People wearing NASA'S T-shirts attend to watch the launching of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

Former NASA astronaut Garrett Reisman holds the sign before the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft at the Kennedy Space Center, in Cape Canaveral, Florida, U.S., May 30, 2020/

SpaceX CEO and owner Elon Musk celebrates after the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

The SpaceX Crew Dragon spacecraft, atop a Falcon 9 booster rocket, is connected to the crew access arm and launch tower on Pad39A at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 29, 2020.

A SpaceX Falcon 9 rocket purges fuel after topping off before scheduled launch, in Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump,watches the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People wearing protective face masks attend to watch the launching of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

NASA astronauts Douglas Hurley and Robert Behnken greet their families before the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft at the Kennedy Space Center, in Cape Canaveral, Florida, U.S., May 30, 2020.

An American flag is seen as SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA astronauts Douglas Hurley and Robert Behnken lifts off during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

A SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA astronauts Douglas Hurley and Robert Behnken lifts off during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

NASA astronauts Douglas Hurley and Robert Behnken head to launch pad 39 to board a SpaceX Falcon 9 rocket for a second launch attempt on NASA?s SpaceX Demo-2 mission to the International Space Station from NASA?s Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump walks down the steps of Air Force One as he arrives to attend the launch of SpaceX Falcon 9 rocket and Crew Dragon spacecraft from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People meet to watch the launching of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

NASA astronauts Douglas Hurley and Robert Behnken head to launch pad 39 to board a SpaceX Falcon 9 rocket for a second launch attempt on NASA’s SpaceX Demo-2 mission to the International Space Station from NASA’s Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump, U.S. Vice President Mike Pence and his wife Karen Pence watch the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People attend to watch the launching of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

The SpaceX Crew Dragon spacecraft sits atop a Falcon 9 booster rocket on Pad39A at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 30, 2020.

A SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA astronauts Douglas Hurley and Robert Behnken lifts off during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.

People meet to watch the launching of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft carrying NASA's astronauts Douglas Hurley and Robert Behnken during NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center, in Cape Canaveral, Florida, U.S. May 30, 2020.

U.S. President Donald Trump gestures as he speaks at a briefing after the launch of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft on NASA's SpaceX Demo-2 mission to the International Space Station from NASA's Kennedy Space Center in Cape Canaveral, Florida, U.S. May 30, 2020.