A new Senate Democratic report alleges that Iran's government routed approximately $2 billion in USDT transactions last year through Tether, with the stablecoin issuer repeatedly failing to block Iran-connected wallets in a timely manner.

Democrats on the Permanent Subcommittee on Intelligence, part of the Senate Homeland Security and Governmental Affairs Committee, published the report Monday. The Wall Street Journal first reported the document.

What does the report allege?

The report describes USDT as "a significant financial lifeline within Iran's shadow banking network." It adds that "Iran's cryptocurrency-based shadow banking network has processed significant volumes of funds and implicates various Iranian interests."

"Prior to 2024, Tether did not comprehensively and consistently freeze wallets designated by counter-terrorism agencies and continues to fail to proactively block clearly illicit wallets," the report said. "This absence of deterrence invited abuse: terrorist organizations such as Hamas shifted from transacting in Bitcoin and a mix of cryptocurrencies to promoting USDT."

The document does not cite an overall lifetime total for USDT allegedly moved by Iran's government, but quantifies roughly $2 billion in transactions during 2024.

How inconsistent is Tether's freezing record?

The report says Tether's response to law-enforcement requests is uneven. "When Tether does freeze wallets, it sometimes takes weeks, but the company also sometimes responds to requests without actually blacklisting wallets," the report claimed.

Tether has frozen Iran-linked addresses before. According to the company, it has "supported nearly $550 million in Iran-linked" freezes, listing recent actions taken at the request of U.S. authorities.

What is Tether's response?

In a blog post Monday, Tether CEO Paolo Ardoino said: "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 framed the freezes as evidence of compliance rather than proof of persistent gaps. The Senate report treats them as too slow and too narrow to deter sanctioned actors.

Why does this matter now?

The findings land as Congress considers stablecoin legislation that would impose stricter sanctions-screening obligations on issuers serving U.S. customers. Tether, which does not hold a U.S. license, has positioned itself as a global dollar-access rail for markets underserved by traditional banking.

The report broadens the argument beyond Iran. "Cryptocurrencies are actively undermining the attempts of the United States and its allies to prevent the Islamic Republic's regional terrorism," the report said, casting stablecoin adoption as a national-security vulnerability.

What happens next?

The investigation is unlikely to trigger immediate enforcement, but it gives Senate Democrats a documented record to press the Treasury Department and the State Department for coordinated action against Tether addresses identified through blockchain analytics. Tether has previously said it cooperates with law-enforcement requests when received through proper channels, a position Ardoino reiterated in Monday's post.