Key Takeaways
- A Senate Democratic staff report found that 84% of 846 sanctioned wallets linked to Iran and associated groups transacted exclusively or nearly exclusively in USDT.
- The finding lands as US authorities intensify sanctions enforcement against Iranian crypto infrastructure.
- The US already has a mechanism under the GENIUS Act that could restrict foreign stablecoins if issuers fail to comply with lawful orders, though this differs from the EU’s MiCA regime.
Tether’s USDT has emerged at the center of a new US sanctions debate after Senate Democratic investigators said the stablecoin dominated crypto wallets linked to Iran and sanctioned groups.
A minority staff report from the Senate Permanent Subcommittee on Investigations examined 846 wallets designated by US or Israeli authorities between June 2021 and August 2026 for connections to Iran, Hamas, Hezbollah and the Houthis.
It found 84% had transacted exclusively or nearly exclusively in USDT, according to Reuters.
The finding does not establish that Tether knowingly facilitated those transactions. But it raises a broader question: could Washington eventually impose restrictions on USDT that are comparable in effect, though not in structure, to the pressure Tether has faced under Europe’s MiCA regime?
Washington Is Already Tightening the Net
The report arrives during a broader US crackdown on Iranian crypto infrastructure.
In June, the Treasury sanctioned Nobitex and three other Iranian digital-asset exchanges. In August, it targeted another two exchanges, accusing Iranian actors of using lightly regulated crypto platforms to move funds and evade sanctions. OFAC now explicitly treats Iranian digital-asset exchanges as blocked Iranian financial institutions.
Tether, meanwhile, says it actively works with law enforcement. In April, the company said it helped US authorities freeze more than $344 million in USDT across two addresses and works with more than 340 law-enforcement agencies in 65 countries.
In addition, on Sept. 28, the company disclosed that it had supported the freezing of roughly $550 million in USDT across wallets linked by US authorities to Iran’s Central Bank and sanctions networks in 2026.
This included more than $344 million in April and over $130 million in July. Tether said its broader cooperation with more than 340 law enforcement agencies across 67 countries has contributed to over $4.9 billion in asset freezes, arguing that USDT’s traceability and its ability to freeze wallets can help authorities disrupt illicit finance.
US Already Has Its Own MiCA-Like Pressure Point
Europe’s MiCA regime and America’s emerging stablecoin framework are not equivalent.
But the GENIUS Act gives Washington considerable leverage over foreign stablecoin issuers.
Foreign-issued stablecoins generally cannot be made available by US digital-asset service providers unless their issuers can comply with lawful US orders. Treasury can designate a foreign issuer as noncompliant and, after the statutory process, prohibit US service providers from facilitating secondary trading in its stablecoins.
The Treasury is also implementing anti-money-laundering and sanctions requirements under the law, while broader foreign-issuer restrictions are expected to begin taking effect in 2027.
That means Washington does not need to copy MiCA to increase pressure on USDT.
The 84% figure alone does not trigger restrictions against Tether. But combined with Washington’s escalating focus on Iranian crypto flows, it gives policymakers another data point as they decide how aggressively foreign stablecoins should be policed inside the US financial system.
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Dr. Guneet Kaur is a senior editor at CCN.com and a Science Fellow at Exponential Science. She is a fintech and blockchain expert with extensive experience in digital finance education, blockchain ecosystems, and cryptocurrency markets. She has worked with global media such as Cointelegraph, as well as education and blockchain platforms, to design and lead strategic content and learning initiatives. As an educator and assessor for top-tier executive programs, she bridges real-world fintech trends with academic insight.
Dr. Kaur is also a published researcher and peer reviewer across fintech and data science journals, including Financial Innovation Journal and International Journal of Big Data Intelligence and Applications. Her work spans data-driven analysis, Web3 innovation, and technical content development. With a strong foundation in both industry and academia, she translates complex financial technologies into practical applications, empowering learners, professionals, and institutions across the rapidly evolving digital finance landscape.
