Billionaire Elon Musk has been using his social media platform, X, to go to bat for President-elect Donald Trump's Cabinet picks and promote his own preferred candidates, advocating for choices he views as change agents who will help remake the U.S. government.

In several high-profile cases, however, Musk backed people who either lost out on the roles or withdrew from consideration, suggesting some early limits to the Republican mega donor's influence even as he has emerged as one of Trump's most powerful allies.

Musk, who has 206 million followers on X, posted or reposted about Trump's Cabinet picks more than 70 times between Nov. 7 and Nov. 20.