Senate Democrats say Tether’s USDT stablecoin has become a financial lifeline for the Iranian government, letting Tehran move money around international sanctions through a shadow banking network built on the token. The report, published Monday by Democrats on the Senate’s Permanent Subcommittee on Intelligence, argues that the world’s largest stablecoin keeps flowing through Iran-linked wallets despite freeze requests from US authorities.
The document, released by Democrats on the Senate Homeland Security and Governmental Affairs Committee, states that Iran’s crypto-based shadow banking system has processed significant volumes of funds and implicates various Iranian interests. It describes USDT as a significant financial lifeline within that network.
Slow freezes and missed requests
The report is sharply critical of Tether’s enforcement record. It claims the company sometimes takes weeks to freeze wallets after a request, and that it has in some cases responded to authorities without actually blacklisting the accounts in question.
Before 2024, the report says, Tether did not comprehensively and consistently freeze wallets designated by counter-terrorism agencies, and it continues to fail to proactively block clearly illicit wallets. The authors argue that this absence of deterrence invited abuse, noting that groups such as Hamas shifted from transacting in bitcoin and a mix of cryptocurrencies to promoting USDT instead.
The report goes further than the specific case. It frames Iran’s use of the token as an indictment of the sector, writing that cryptocurrencies are actively undermining attempts by the United States and its allies to prevent the Islamic Republic’s regional terrorism.
How Iran’s shadow banking works
The report describes a network of exchange houses and front companies that convert oil revenue and other export earnings into USDT, then move the tokens through wallets in jurisdictions with light oversight. Because USDT settles on public blockchains in minutes and can be traded peer to peer, the authors argue it fills the role that hawala networks and shell banks played in earlier sanction evasion schemes.
Analysts who track Iranian finance have documented a similar pattern since 2018, when US sanctions cut Iranian banks off from the SWIFT messaging system. Stablecoins offered a workaround that needed no banking relationship at all. The subcommittee’s report is the first congressional document to put a formal estimate on how much of that flow runs through Tether specifically.
Tether pushes back with freeze numbers
Tether rejected the picture in a blog post published the same day. The company says it has supported nearly $550 million in Iran-linked freezes and lists recent actions it took at the request of US authorities.
“As governments intensify efforts to disrupt sanctions evasion and terrorist financing, we remain in regular and direct coordination with authorities in the United States and around the world to help ensure that illicit funds can be identified and frozen,” Tether CEO Paolo Ardoino said in the post.
The company has argued in past disputes that it freezes more addresses than any other stablecoin issuer and that it cannot act on wallets it does not know about. The report counters that many Iran-linked wallets were flagged to the company long before any freeze took place.
The exchange of statements lands at a sensitive moment for the issuer. A separate US forfeiture case against payment processor Capstone froze funds tied to EQIBank, a banking partner of Tether, and the company has said its own exposure there is minimal.
Why the timing matters
The report arrives while the Iran war dominates Washington’s agenda and oil trades above $100 a barrel. President Trump rejected Tehran’s proposal to reopen the Strait of Hormuz over the weekend, and sanctions enforcement against Iranian revenue streams has become a live policy question rather than a technical one.
It also lands in the middle of a US stablecoin policy fight. The Federal Reserve proposed the first GENIUS Act rules for bank-issued payment stablecoins on Monday, setting reserve, capital and application standards with a 60-day comment period. Lawmakers who want stricter oversight of offshore issuers now have a fresh document to cite, and the subcommittee’s findings give them a ready-made case study of enforcement gaps.
Tether’s USDT remains the most traded digital asset in the world and the default settlement token on most offshore exchanges. Any regulatory action against it would move markets far beyond Iran-related wallets, which is why previous congressional scrutiny of the issuer has stopped short of concrete measures.
What happens next
The report comes from the minority side of the committee, so it carries no legal force on its own. Its practical weight depends on whether it feeds into pending stablecoin legislation or prompts Treasury action against Iran-linked wallets and the exchanges that serve them.
Republicans on the committee did not sign the document, and Tether is incorporated in El Salvador, which limits the direct tools available to US regulators. Still, the findings could shape how banks and payment companies treat USDT in the meantime. Several large US platforms already refuse the token, citing the same enforcement concerns the report raises.
For Tether, the immediate fight is over the record. The company’s blog post frames the $550 million freeze figure as evidence of cooperation, while the report treats the same history as proof that freezes come late and incomplete. Both cannot be true at once, and the gap between those two descriptions is likely to shape the next round of hearings.
Traders mostly shrugged. Bitcoin held near $83,000, down about 1.6% on the day, with the market focused on Iran headlines and ETF flows rather than the Senate document. USDT held its dollar peg through the session.