Senator Elizabeth Warren opposes the recent policy allowing the use of cryptocurrencies in 401(k) retirement plans in the United States, warning that this move "creates a breeding ground for significant losses for workers and families." In a letter to the U.S. Securities and Exchange Commission (SEC), she pointed out that these speculative assets are highly volatile and lack transparent regulation, posing excessive risks to most savers. This concern aligns with other lawmakers' worries that the policy could undermine long-term retirement security measures.