United States Treasury building in Washington, D.C. for a story about GENIUS Act stablecoin implementation.

Senators Tell Treasury: Don’t Lock States Out of the Stablecoin Rulebook

By Isaac • June 17, 2026 9:21 am • Comments

The GENIUS Act passed. Now the fight is over who controls the rulebook.

A bipartisan group of senators sent a letter to Treasury Secretary Scott Bessent on June 16, 2026, asking him to make sure states keep a real role in supervising stablecoins under the new federal framework.

The senators want written procedural guidance for how state regulatory regimes get certified as substantially similar to the federal standard. That certification lives in Section 4(c) of the GENIUS Act, and right now the path through it is unclear.

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The lead signer is Cynthia Lummis, who has spent years working crypto policy in the Senate.

Their core ask is simple. States should be able to seek certification on an ongoing basis, more than through one early window that slams shut.

The reason is practical. State legislatures do not all move on the same calendar, and some states only meet on biennial cycles, so a single short window could leave entire states unable to qualify.

The senators warned that without clear timelines and requirements, certification could be foreclosed for states in the future.

CoinDesk framed the Treasury dispute:

A bipartisan group of senators led by Cynthia Lummis is pressing Treasury to make sure states keep a real role in GENIUS Act stablecoin supervision.

The issue is not whether the federal government has a role. The question is whether states will have a clear process to prove their regulatory regimes are substantially similar to the federal framework.

Treasury’s proposed principles did not address the timeline and procedural requirements for state certification.

That omission matters because a vague process can become a practical exclusion. If states do not know when or how to apply, federal implementation can narrow the dual-track model Congress wrote into the law.

The senators’ concern is especially important for smaller or regional issuers that may prefer state supervision, and for state regulators that have already built digital-asset oversight programs.

For the stablecoin market, the message is straightforward: passage of a law does not end the fight. Implementation decides who gets to supervise issuers and how competitive the market becomes.

The report flagged the specific gap: Treasury’s proposed principles did not address the timeline or procedural requirements for state certification.

That gap is the whole story. A law can promise state authority on paper and still strand it in implementation if the procedure never gets written down.

Senator Cynthia Lummis published the senators’ letter:

The June 16 letter asks Treasury Secretary Scott Bessent for written procedural guidance on Section 4(c) state regulatory regime certification.

The senators say states must be able to seek certification as stablecoin charters and regulatory regimes develop, rather than through a single early window.

They point out that state legislative schedules vary significantly, and some states operate on biennial cycles. A one-time process could punish states for calendar timing rather than regulatory quality.

The letter asks Treasury to confirm that certification remains available on an ongoing basis and that states will have clear timelines and a flexible process.

The signers are Cynthia Lummis, Kirsten Gillibrand, Pete Ricketts, Catherine Cortez Masto, Kevin Cramer, Angela Alsobrooks, and Bill Hagerty.

That bipartisan signer list is the political signal. Senators who helped shape stablecoin law are now warning Treasury not to implement it in a way that sidelines state authority.

It frames the flexibility request around those varying legislative schedules, so a state that needs to amend its laws still gets a fair shot at qualifying.

The signers cross party lines: Cynthia Lummis, Kirsten Gillibrand, Pete Ricketts, Catherine Cortez Masto, Kevin Cramer, Angela Alsobrooks, and Bill Hagerty.

The Block added a second policy read:

The story is a bipartisan push for Treasury to uphold state authority under the GENIUS Act.

That second market-policy read reinforces that this is far from a niche procedural fight. It is about how federal agencies translate a stablecoin law into operating rules for issuers.

State authority matters because stablecoins sit between payments, banking, securities-style custody questions, and crypto market liquidity.

If Treasury defines state certification narrowly, federal channels could become the dominant route for approved stablecoin issuers.

If Treasury keeps the pathway flexible, states can continue competing as regulatory homes for compliant issuers under the federal standard.

That implementation choice can affect innovation, competition, supervision costs, and the speed at which new payment stablecoins reach the market.

The reporting underscored that the dispute now is about implementation, not whether the law exists. Passage settled the framework.

The certification process settles who actually gets to regulate inside it.

This matters because stablecoins are core market plumbing now.

CoinGecko showed why stablecoins are central market infrastructure:

The June 17 market snapshot placed Tether and USDC among the six largest crypto assets by market capitalization.

That ranking matters because stablecoins are not a fringe corner of crypto. They are liquidity, collateral, payment, and settlement tools used across centralized exchanges, DeFi protocols, and cross-border payment products.

The GENIUS Act implementation fight therefore reaches beyond Washington process. It can affect the entities issuing dollar tokens and the rules that govern reserve backing, redemption, reporting, and supervision.

For crypto traders, developers, and payment companies, stablecoin rules shape basic market plumbing.

For state regulators, the question is whether their supervisory systems can continue to compete under a federal standard.

When two of the biggest assets in crypto are dollar tokens, the rules over who supervises them touch issuers, exchanges, and payment rails across the entire market.

State-level oversight has been part of how stablecoin issuers operate for years. A clean dual-track system, where qualified state regimes run alongside the federal standard, gives issuers options and keeps a single federal bottleneck from becoming the only door.

Treasury has not rejected state participation, and no issuer has won or lost certification yet. The senators are trying to lock in clarity before the procedure hardens into something states cannot navigate.

That is the right instinct. The headline law was the easy part, and the durable answer on stablecoin supervision will come from the procedural fine print Treasury writes next.

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