A cryptocurrency market structure bill collapsed in the United States Senate in September 2026 after criticism from which committee's top Democrat?

Explanation: A cryptocurrency bill collapsed in the United States Senate after the top Democrat on the Senate Banking Committee warned that it posed "massive risks to families, our national security and our economy." Crypto market structure legislation has repeatedly stalled in Congress amid disagreements over investor protection, regulatory jurisdiction between agencies and the appropriate level of oversight for digital asset exchanges and stablecoin issuers.