Donald Trump softened his public stance on prediction markets days after criticizing their rapid rise. Speaking to reporters in Florida on Saturday, he said some experienced participants support these platforms, while he continued to express concern about how quickly they are expanding. The updated remarks add nuance to his earlier warning that the United States could fall behind other countries if it does not engage with prediction markets. The article also notes that Donald Trump Jr. has invested in Polymarket, a blockchain-based prediction market, and serves as an adviser to Kalshi, a U.S.-based prediction market platform.