Argentine President Javier Milei is facing a corruption probe into his promotion of a meme coin, which is a highly speculative form of cryptocurrency that’s seen a recent surge in popularity after President Donald Trump and his wife launched tokens of their own.

Here’s what happened: Late Friday night, Milei fired off a tweet lending his support to a cryptocurrency token called $LIBRA. Milei described the coin to his nearly four million followers as a “private project dedicated to encouraging the growth of the Argentine economy,” claiming that it would be “funding small Argentine businesses and ventures.”

LIBRA, a Solana-based project that President of Argentina Javier Milei tweeted about on Feb. 14, saw its market cap rise as high as $4.5 billion and then fall more than 80% within a couple of hours as insiders cashed out, leaving many bag holders with massive losses.