A judge in Argentina has been selected to investigate allegations of fraud against President Javier Milei for his brief promotion of a cryptocurrency that collapsed in value hours after it was launched last week.

Argentine President Javier Milei is facing calls for impeachment after promoting a little-known cryptocurrency, whose price soared then collapsed after his endorsement, leading to losses for thousands of investors.

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.”