Donald Trump weighed in Saturday in a bitter debate dividing his traditional supporters and tech barrons like Elon Musk, saying that he backs a special visa program that helps highly skilled workers enter the country.

“I’ve always liked the (H1-B) visas, I have always been in favor of the visas, that’s why we have them” at Trump-owned facilities, the president-elect told the New York Post in his first public comments on the matter since it flared up this week.

An angry back-and-forth, largely between Silicon Valley’s Musk and traditional anti-immigration Trump backers, has erupted in fiery fashion, with Musk even vowing to “go to war” over the issue. Trump’s insistent calls for sharp curbs on immigration were central to his election victory in November over President Joe Biden. He has vowed to deport all undocumented immigrants and limit legal immigration.

But tech entrepreneurs like Tesla’s Musk – as well as Vivek Ramaswamy, who with Musk is to co-chair a government cost-cutting panel under Trump – say the United States produces too few highly skilled graduates, and they fervently champion the H1-B program.

Musk, who himself migrated from South Africa on an H1-B, posted Thursday on his X platform that luring elite engineering talent from abroad was “essential for America to keep winning.” Adding acrimony to the debate was a post from Ramaswamy, the son of immigrants from India, who deplored an “American culture” that he said venerates mediocrity, adding that the United States risks having “our asses handed to us by China.”

That angered several prominent conservatives who were backing Trump long before Musk noisily joined their cause this year, going on to pump more than $250 million into the Republican’s campaign.

Musk, who had already infuriated some Republicans after leading an online campaign that helped tank a bipartisan budget deal last week, fired back at his critics. Posting on X, the social media site he owns, he warned of a “MAGA civil war.” Musk bluntly swore at one critic, adding that “I will go to war on this issue.”

That, in turn, drew a volley from Trump strategist Steve Bannon, who wrote on the Gettr platform that the H1-B program brings in migrants who are essentially “indentured servants” working for less than American citizens would. In a striking jab at Trump’s close friend Musk, Bannon called the Tesla CEO a “toddler.”

Some of Trump’s original backers say they fear he is falling under the sway of big donors from the tech world like Musk and drifting away from his campaign promises.