Elon Musk, Jeff Bezos and Mark Zuckerberg will attend President-elect Donald Trump’s inauguration Monday, according to an official involved with planning the event. They will have a prominent spot at the ceremony,

"Elon has been very clear that he's doing this for the public interest and not for his personal gain," Bezos said in a new interview.

The three CEOs have all donated at least $1 million to the Trump-Vance inaugural committee, and Musk is considered a close Trump ally.

Amazon’s Jeff Bezos founded the company 25 years ago. He took part in Monday’s countdown from Mission Control, located at the rocket factory just outside the gates of NASA’s Kennedy Space Center about 50 miles (80 kilometers) east of Orlando, Florida.

Jeff Bezos’s space company Blue Origin postponed the inaugural launch of its new rocket early Monday, after running into technical problems. Blue Origin had planned to attempt to blast off its New Glenn rocket from a site in Florida.

New Glenn rocket was supposed to blast off before dawn Monday with a prototype satellite. But ice formed in a purge line for a unit powering some of the rocket’s hydraulic systems and launch controllers ran out of time to clear it,