Washington DC - Elon Musk on Thursday ratcheted up his public spat with Donald Trump, saying the US president would have lost the election without his support.

Is the bromance officially over?

The back-and-forth social media battle – a continuation from similar comments Trump made earlier on Thursday slamming the tech mogul – reveals the once-strong friendship breaking down in real-time.

"Elon was 'wearing thin,' I asked him to leave," Trump wrote in one particularly viral Truth Social post.

Celebrities Harvey Weinstein trial wraps as prosecutor tells jurors "no means no"

"I took away his EV Mandate that forced everyone to buy Electric Cars that nobody else wanted (that he knew for months I was going to do!), and he just went CRAZY!"

The former DOGE head claimed that Trump's account was "such an obvious lie. So sad."

"Without me, Trump would have lost the election," the top Trump campaign donor posted on X.

"Such ingratitude," he added.

Elon also referred back to Trump's old comments on the US budget.

"Where is the man who wrote these words?" Elon said in another X post. "Was he replaced by a body double!?"

Tesla shares fell sharply on Wall Street, down 8%, on Thursday immediately after the social media fight erupted between the Republican president and the electric car company's CEO.

Things once again escalated after Trump threatened to "terminate" the SpaceX boss' subsidies and contracts.

Musk's relentless X tirade continued as the day wore on, endorsing calls for the president to be impeached, threats to "decommission" the critical US spaceship program, and even claims that Trump is involved in the notorious Epstein sex trafficking scandal.

"Time to drop the really big bomb," Musk wrote on X. "@realDonaldTrump is in the Epstein files. That is the real reason they have not been made public."

"Mark this post for the future. The truth will come out," he added.