Tech billionaire Elon Musk on Wednesday, June 11, expressed regret over a series of social media posts he made about U.S. President Donald Trump last week, amid a heated public fallout with the former ally.

The dispute has effectively ended what was once a close partnership, which had seen Musk lead the cost-cutting Department of Government Efficiency under Trump’s second administration. The breakdown has sparked concerns among investors about the future prospects of Musk’s flagship companies, Tesla and SpaceX.

“I regret some of my posts about President @realDonaldTrump last week. They went too far,” Musk said on the X social media platform.

The clash was sparked by Musk's denunciation of the Trump administration's proposed spending bill, a sprawling piece of legislation seen as central to Trump's domestic agenda during his second term. Musk labelled the bill a "disgusting abomination" and urged political retribution against Republican lawmakers who backed it.

That call did not go unnoticed in the White House.

Speaking to NBC News on Saturday, President Trump responded , warning Musk of "very serious consequences" should the billionaire follow through on funding primary challengers against sitting Republican lawmakers.