Following the collapse of crypto exchange FTX, US Senators today sent another letter to investment firm Fidelity Investments, warning it against offering Bitcoin to its customers. Senators Elizabeth Warren of Massachusetts, Tina Smith of Minnesota, and Richard Durbin of Illinois all signed the letter requesting that Fidelity discontinue its Bitcoin 401(k) plan. Boston-based Fidelity, one of the world’s largest asset managers, is the largest provider of 401(k) savings accounts in the United States. The company launched a new product in April that gives companies and their participating employees access to Bitcoin. However, in May, Senators Warren and Smith wrote to Fidelity, telling them it was a bad idea. This time, a new letter was sent, which was also signed by Senator Durbin.