A billionaire investor is suing the Trump family’s crypto company over claims of extortion.

The Trump family’s World Liberty crypto venture is being sued by one of its billionaire backers over allegations of extortion.

Justin Sun has accused World Liberty of an “illegal scheme” to seize his WLFI tokens, a cryptocurrency issued by the company.

Sun alleges the firm, co-founded by US President Donald Trump and his son Eric Trump, has “frozen” all of his tokens and stripped him of his right to vote on governance issues.

The BBC has contacted Trump and World Liberty for comment.

Sun is an ardent supporter of Trump and his stance on cryptocurrencies, but accused “certain individuals” associated with World Liberty of acting against the president’s values.

“They wrongfully froze all of my tokens, stripped me of my right to vote on governance proposals, and have threatened to permanently destroy my tokens by ‘burning’ them – all without any proper justification,” he said in a social media post announcing the lawsuit.

Sun, the founder of the multi-billion dollar crypto project TRON, first put $45 million (£33 million) into World Liberty. He mentioned that at certain points, his WLFI tokens have been worth over $1 billion (£740 million).

Since September, the price of a single WLFI token has plunged from 31 cents to just under 8 cents.

Sun said his backing was driven by the Trump family’s association with the project and his long-standing support for cryptocurrencies. He also bought $100m of Trump’s meme coins in July 2025, as well.

But Sun alleged that those running World Liberty, including another co-founder, Chase Herro, are using it as a “golden opportunity to leverage the Trump brand to profit through fraud”.

In his complaint, filed on Tuesday in a San Francisco federal court, Sun argues that initial promises to give token-holders the option to trade the currency in future “were false and misleading”.

While the tokens at large became tradeable, Sun said World Liberty has blocked him from being able to sell a single one, and is now threatening to “burn” his – deleting them entirely.

WLFI has denied wrongdoing and accused Sun of “playing the victim while making baseless allegations to cover up his own misconduct”.

Investors have also grown concerned about World Liberty borrowing against the value of its tokens.

The Securities and Exchange Commission has ended its investigation into Sun, while Senator Elizabeth Warren, a Democrat, raised questions about whether it was connected to his investments in Trump’s crypto ventures. Sun had faced accusations of paying prominent influencers to promote his companies on social media without disclosing the payments.