US senators from both parties urged the Treasury Department to uphold states' regulatory powers over stablecoins under the GENIUS Act.

CoinFeed reported on June 17 that, according to The Block, a bipartisan group of lawmakers led by Senator Cynthia Lummis has written to the Treasury Department requesting the preservation of states' power to regulate stablecoins under the GENIUS Act. This act allows stablecoin issuers with a market capitalization not exceeding $10 billion to be regulated by states, provided that state-level rules are "substantially similar" to federal rules. In April, the Treasury Department released proposed rules outlining broad principles for determining whether state-level regulations are "substantially similar," but did not specify a timeline or standards for state-level regulation. The senators stated in their letter that this lack of clarity "creates uncertainty for states," and therefore requested the Treasury Department to issue guidance clarifying the application, review, and certification processes for state-level regulations. The New York State Department of Financial Services has already submitted formal rules last week to align its stablecoin framework with the GENIUS Act.