Cynthia Lummis says Tether lawsuit exposes a major gap in U.S. stablecoin rules
Senator Cynthia Lummis is warning that legal uncertainty could make it harder for stablecoin issuers and crypto exchanges to help law enforcement fight financial crime.
Her comments came on September 10 in response to a lawsuit involving Tether and the freezing of $42.4 million in USDT. Lummis said the case shows why clearer federal rules are needed for digital asset companies that act on suspected criminal activity.
“This lawsuit highlights a dangerous gap in the fight against illicit finance in crypto,” Lummis wrote in a post on X.
At the center of the debate is whether stablecoin issuers should be protected from civil lawsuits when they freeze funds in good faith after identifying suspicious activity or receiving a request from law enforcement. Lummis argues that without legal protections, companies could be punished for cooperating with authorities, even when their actions are meant to stop fraud, money laundering, or other illicit activity.
The dispute involves two Thai businessmen who filed a lawsuit against Tether in the U.S. District Court for the Southern District of New York. They claim Tether froze 42.4 million USDT spread across 10 Ethereum addresses on October 30, 2025, after an informal request from U.S. law enforcement.
According to the plaintiffs, there was no warrant or formal legal order at the time the funds were frozen. They say a seizure warrant was not issued until February 19, 2026, several months after Tether had already blocked access to the tokens.
The plaintiffs are asking the court to remove the Ethereum addresses from Tether’s blacklist. They also want to stop the frozen USDT from being destroyed, reissued, or transferred to a government-controlled wallet. The lawsuit includes claims of conversion, trespass to chattels, and unjust enrichment, along with a demand for damages.
Tether has denied the allegations and described the lawsuit as baseless. The company says its actions are part of its ongoing cooperation with global law enforcement agencies to prevent USDT from being used in criminal schemes.
The frozen funds have reportedly been tied to a wider U.S. Justice Department investigation involving more than $61 million in USDT allegedly stolen through “pig-butchering” scams. These scams typically involve fraudsters building trust with victims over time before convincing them to invest in fake cryptocurrency opportunities. Authorities have credited Tether with helping move seized assets connected to the investigation.
Lummis believes the situation highlights the importance of Section 305 of the proposed Digital Asset Market CLARITY Act. That section would give crypto exchanges and stablecoin issuers clearer legal authority to temporarily pause transactions or freeze assets suspected of being linked to illegal activity.
The provision would also offer protection from civil liability when companies act in good faith and within the boundaries of the law. If an official law enforcement request is involved, the hold period could be extended.
Supporters say this type of safe harbor is necessary because stablecoin issuers are often on the front line when suspicious transactions appear on blockchain networks. Without a clear legal framework, companies may hesitate to act quickly out of fear that freezing assets could trigger costly lawsuits.
For Lummis, the issue is not about giving crypto firms unlimited power over customer funds. Instead, she says the goal is to create a balanced system where companies can respond to suspected criminal activity while operating under clear rules and legal safeguards.
The debate comes as the CLARITY Act moves closer to a key Senate vote. The bill passed the House in 2025 and is scheduled for a procedural vote in the Senate on September 15. If advanced, it could become one of the most important pieces of U.S. crypto legislation, setting clearer rules for digital asset markets and dividing oversight responsibilities between the Securities and Exchange Commission and the Commodity Futures Trading Commission.
The Tether lawsuit has now become a real-world example of the legal challenges facing stablecoin regulation. As stablecoins such as USDT continue to play a major role in crypto trading, payments, and cross-border transfers, lawmakers are under growing pressure to clarify how issuers should respond when funds are suspected of being tied to fraud or criminal activity.
Whether Section 305 becomes law could have major consequences for the future of stablecoin enforcement in the United States. If passed, it may give companies more confidence to cooperate with law enforcement. If it fails, cases like the Tether lawsuit could make crypto firms more cautious about freezing suspicious funds, even when authorities believe those assets are linked to serious financial crimes.
