Former President Donald Trump took to his social media platform Truth Social Tuesday evening to bash Elon Musk and claim the world's richest man once called himself a "big Trump fan," after Musk was hit with a lawsuit for terminating his $44 billion deal to buy Twitter, marking the latest parry in an escalating war of words between the two outspoken billionaires.

Trump took partial credit for generating Musk's massive wealth, claiming in a post that Musk would be "worthless" and his business ventures would have failed without government subsidies that Musk supposedly asked Trump to approve (Musk was already a billionaire before Trump took office, but his net worth spiked in 2020, largely due to a surge in Tesla’s share price).

The former president ridiculed Musk's products, saying his companies like Tesla and SpaceX have produced "driverless cars that crash" and "rocketships to nowhere," while calling Twitter "perhaps worthless."

Musk on Monday night launched his own attacks against Trump, saying the 76-year-old ex-president was a “bull in a china shop” and should "hang up his hat & sail into the sunset."

Musk also denied that he told Trump he voted for him, a claim Trump made at a Saturday rally, but Trump doubled down on Tuesday and insisted Musk said he was "a big Trump fan and Republican" during a White House visit.

Trump at the Saturday rally labeled Musk "another bullshit artist" for trying to get out of the Twitter deal.

Musk responded to Trump’s Truth Social posts Tuesday by tweeting a GIF of the popular "Old Man Yells at Cloud" meme from the Simpsons.