Elon Musk has called President Donald Trump‘s comments about him “so disappointing.”

The Musk-Trump feud reignited over the president’s “One, Big, Beautiful Bill Act,” which the billionaire CEO of Tesla and SpaceX sees as an unacceptable multi-trillion-dollar expansion of the federal debt. Musk touted forming a new “America Party.”

In a post on Truth Social, Trump took aim at Musk for the subsidies his companies have received, particularly for electric vehicles. Trump said without them, Musk would “probably have to close up shop and head back home to South Africa.”

Trump had also said “we’ll have to look” when asked if he would consider deporting Musk.

Responding to Trump’s remark, Musk wrote on X, formerly Twitter: “Just plain wrong. So disappointing.” Musk became a naturalized U.S. citizen more than two decades ago.

Musk/Trump
Elon Musk in the Oval Office of the White House in May, and President Donald Trump speaking at a new migrant detention facility in Florida on Tuesday.

Evan Vucci/AP

This is a breaking news story. Updates to follow.