Tesla CEO Elon Musk took a pot shot at President Joe Biden on Sunday, the day after his private spaceflight, SpaceX, completed a historic mission as the first all-civilian flight crew.

One of Musk’s followers on Twitter asked him, “The President of the United States has refused to even acknowledge the 4 newest American astronauts who helped raise hundreds of millions of dollars for St. Jude. What’s your theory on why that is?”

Musk replied, “He’s still sleeping.”

The quartet of newly minted citizen astronauts comprising the SpaceX Inspiration4 mission safely splashed down in the Atlantic off Florida’s coast on Saturday, completing a three-day flight of the first all-civilian crew ever sent into Earth orbit.

The successful launch and return of the mission, the latest in a recent string of rocket-powered expeditions bankrolled by their billionaire passengers, marked another milestone in the fledgling industry of commercial astro-tourism, 60 years after the dawn of human spaceflight.

SpaceX, the private rocketry company founded by Tesla Inc electric automaker CEO Elon Musk, supplied the spacecraft, launched it, controlled its flight and handled the splashdown recovery operation.

The three-day mission ended as the SpaceX Crew Dragon capsule, dubbed Resilience, parachuted into calm seas around 7 p.m. EDT (2300 GMT), shortly before sunset, following an automated reentry descent, as shown during a live SpaceX webcast on its YouTube channel. (Mint)