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.

Shares in Musk’s Tesla (TSLA.O), opens new tab 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.

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.