Elon Musk, the billionaire entrepreneur and boss of X platform, swiftly criticized Vice President Kamala Harris after President Joe Biden backed her when he announced the end of his re-election campaign this week.

“It has been the greatest honor of my life to serve as your President,” Biden wrote in a letter posted to social media and elsewhere online on Sunday. “And while it has been my intention to seek reelection, I believe it is in the best interest of my party and the country for me to stand down and to focus solely on fulfilling my duties as President for the remainder of my term.”

Not long afterward, he endorsed Harris. “My very first decision as the party nominee in 2020 was to pick Kamala Harris as my Vice President,” the president said. “And it’s been the best decision I’ve made.

“Today I want to offer my full support and endorsement for Kamala to be the nominee of our party this year. Democrats — it’s time to come together and beat Trump. Let’s do this,” he added.

Musk then posted a clip of Harris chairing a meeting and saying: “Good afternoon. I want to welcome these leaders for coming in to have this very important discussion about some of the most pressing issues of our time. I am Kamala Harris. My pronouns are ‘she’ and ‘her.’ I am a woman sitting at the table wearing a blue suit.”

Musk wrote: “Imagine 4 years of this…”