Cryptocurrency billionaire Justin Sun is suing World Liberty Financial, a crypto venture co-founded by President Donald Trump and his sons, alleging the company illegally blocked him from selling digital tokens worth up to $1 billion. 

The lawsuit, filed on Tuesday in California federal court, also accuses World Liberty Financial of trying to pressure Sun into investing “hundreds of millions of dollars to mint USD1, World Liberty’s stablecoin.” The complaint alleges that the company froze his World Liberty Financial tokens after Sun refused to commit more money to the business. 

Sun also alleged that World Liberty Financial secretly changed contractual rules governing when owners of its tokens could sell their holdings, giving the…