The US president accused the billionaire of sowing "chaos" with his new third-party initiative

US President Donald Trump has lashed out at Elon Musk over the tech billionaire's plan to launch a new political party, accusing him of promoting "disruption and chaos" and undermining the stability of the American political system.

In a post on Truth Social late Sunday, Trump criticized Musk for what he described as erratic behavior in recent weeks, calling the entrepreneur a "train wreck." He claimed that Musk's proposal to form a third party - dubbed the "America Party" - would fail and only serve to divide voters.

"I am saddened to watch Elon Musk go completely 'off the rails,' essentially becoming a TRAIN WRECK over the past five weeks," Trump wrote. "He even wants to start a Third Political Party, despite the fact that they have never succeeded in the United States - the system seems not designed for them."

"The one thing Third Parties are good for is the creation of Complete and Total DISRUPTION & CHAOS," the president added, accusing the Democratic Party for already bringing "enough of that."

Trump also defended his recently signed multitrillion-dollar spending package, dubbed the "Big Beautiful Bill," which has drawn sharp criticism from Musk. The president claimed that the billionaire opposed the legislation only because it eliminated federal electric vehicle mandates that had benefited Musk's business. Trump also took issue with Musk's alleged attempt to have one of his associates appointed to run NASA, noting that the candidate was a Democrat and that the appointment would have raised concerns over a conflict of interest, given Musk's ties to the space industry.

"My number one charge is to protect the American public!" Trump wrote.

The remarks follow Musk's announcement on Friday that he is moving ahead with the creation of the America Party, pledging to "give freedom back to the people" and attacking both major parties for "bankrupting" the country.

The billionaire did not elaborate on how much progress he had made with the plan but briefly outlined his strategy and hinted that the first move could be expected "next year," during the US midterm elections in November 2026, when 33 of the 100 Senate seats and all 435 House seats will be up for grabs.

"The way we're going to crack the uniparty system is by using a variant of how Epaminondas shattered the myth of Spartan invincibility at Leuctra: extremely concentrated force at a precise location on the battlefield," Musk stated.

Musk previously insisted that his criticism of Trump and his policies was not about subsidies but was triggered by a sharp budget deficit hike he had been recruited to reduce. The tech billionaire was one of the key figures in the Department of Government Efficiency (DOGE), a much-hyped temporary organization established to cut budget costs and excessive federal spending.

Since the honeymoon ended, Musk and Trump have been locked in a recurring war of words, with the US president accusing his former close ally of receiving more US government subsidies "than any human being in history," threatening to sic DOGE on him, and even mulling a potential deportation of the South African-born entrepreneur.