(Reuters) -U.S. President Donald Trump is not interested in talking with his former ally Elon Musk, amid a bitter feud over the president’s sweeping tax-cut bill, a White House official said on Friday, adding that no phone call between the two men is planned for the day.

A separate White House official had said earlier that Trump and Musk were going to talk to each other on Friday.

“I’m not even thinking about Elon. He’s got a problem, the poor guy’s got a problem,” Trump told CNN on Friday morning.

Trump, the world’s most powerful leader, and Musk, the world’s richest man, battled openly on Thursday in an extraordinary day of hostilities – largely over social media – that marked a stark end to a close alliance.

Tesla Shares Rebound After Historic Plunge

Shares in Musk’s Tesla rose 4.5% when markets opened on Friday. In Thursday’s session, the stock dived 14% and lost about $150 billion in value, the largest single-day decline in the electric vehicle maker’s history.

Musk bankrolled a large part of Trump’s presidential campaign and was then brought to the White House to head up a controversial effort to downsize the federal workforce and slash spending.

The falling-out began brewing days ago when Musk, who left his role as head of the Department of Government Efficiency a week ago, denounced Trump’s tax-cut and spending bill. The feud is complicating efforts to pass the bill, which is the president’s main demand of the Republican-controlled Congress.

Musk has denounced the package, which contains most of Trump’s domestic priorities, as a “disgusting abomination” that would add too much to the nation’s $36.2 trillion in debt.

Congressional Battle Over Spending Package Intensifies

The package narrowly passed the House of Representatives last month and is now before the Senate, where Republicans say they will make further changes. Nonpartisan analysts say it would add $2.4 trillion in debt over 10 years.

House Speaker Mike Johnson said he has been in touch with Musk.

“I don’t argue with him about how to build rockets and I wish he wouldn’t argue with me about how to craft legislation and pass it,” he said on CNBC.

Trump had initially stayed quiet while Musk campaigned to torpedo the bill, but broke his silence on Thursday, telling reporters he was “very disappointed” in Musk.

“Look, Elon and I had a great relationship. I don’t know if we will anymore,” he said.

Social Media War Erupts Between Former Allies

The pair then traded barbs on their social media platforms: Trump’s Truth Social and Musk’s X.

“Without me, Trump would have lost the election,” wrote Musk, who spent nearly $300 million backing Trump and other Republicans in last year’s election.

Musk also asserted that Trump’s signature import tariffs would push the U.S. into a recession and responded “Yes” to a post on X saying Trump should be impeached. That would be highly unlikely given Trump’s Republicans hold majorities in both chambers of Congress.

Trump, for his part, suggested he would terminate government contracts with Musk’s businesses, which include rocket company SpaceX and its satellite unit Starlink.

Musk, whose space business plays a critical role in the U.S. government’s space program, responded that he would begin decommissioning SpaceX’s Dragon spacecraft, which is the only U.S. spacecraft capable of sending astronauts to the International Space Station. He backed off the threat later in the day.

In a sign of a possible detente, Musk subsequently wrote: “You’re not wrong” in response to billionaire investor Bill Ackman saying Trump and Musk should make peace.

A prolonged feud between the pair could make it harder for Republicans to keep control of Congress in next year’s midterm elections if Musk withholds financial support or other major Silicon Valley business leaders distance themselves from Trump.

Musk had already said he planned to curtail his political spending, and on Tuesday he called for “all politicians who betrayed the American people” to be fired next year.

His involvement with the Trump administration has provoked widespread protests at Tesla sites, driving down sales while investors fretted that Musk’s attention was too divided.

(Additional reporting by Susan Heavey and Jarrett RenshawWriting by Andy SullivanEditing by Scott Malone and Frances Kerry)