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Senator Richard Blumenthal on Monday, Sept. 28, 2026, referred a Senate investigation into Tether to the Treasury Department and the Justice Department, alleging the world’s largest stablecoin has become a key channel for Iran-linked sanctions evasion. The 28-page report from the Senate Permanent Subcommittee on Investigations calls USDT a “significant financial lifeline” inside Iran’s shadow banking network.
What happened
Democratic investigators reviewed blockchain data for 846 crypto wallets sanctioned or targeted for seizure over ties to Iran and regional groups. They found that 84% of those wallets transacted exclusively or nearly exclusively in USDT, citing its easy trading, exchange access, and broad use. Blumenthal, the ranking member, sent the findings to Treasury Secretary Scott Bessent and Attorney General Todd Blanche, asking them to examine Tether’s sanctions and anti-money-laundering controls. The report also alleged Tether missed several chances to block suspect wallets and noted the company had not answered a June 4 records request.
Tether pushed back. CEO Paolo Ardoino said “USDT is not a haven for sanctioned actors,” and the company said it helped freeze nearly $550 million in Iran-linked USDT during 2026 — more than $344 million across two wallets in April and more than $130 million across four Central Bank of Iran wallets in July, reviewed by Chainalysis. Tether added it has helped freeze more than $4.9 billion in total across cases worldwide, with over $2.4 billion connected to US authorities.
Why it matters
- Formal DOJ/Treasury scrutiny of the dominant stablecoin issuer is the biggest regulatory overhang for the stablecoin market since the CLARITY Act failed in the Senate.
- Compliance costs for issuers and exchanges could rise if Treasury expands stablecoin sanctions rules — a risk factor for any crypto allocation, including for everyday investors holding spot ETFs.
- The probe lands alongside active Treasury action on Iranian crypto channels: OFAC designated Iranian platform BitBank on Sept. 17, and New York prosecutors filed a ~$61 million crypto forfeiture complaint on Sept. 14 tied to sanctioned Iranian oil sales.
What to watch
Whether Bessent and Blanche open formal investigations, the next OFAC designations of Iranian crypto networks, and whether Tether answers the subcommittee’s records request. Treasury’s payment stablecoin rulemaking — now advancing without CLARITY — will shape how much new compliance burden falls on issuers.
Related reading: US Sanctions 13 Tied to Iran Weapons Procurement
Sources:
Cointelegraph · TokenPost · BlockonomiWhat would convince you USDT’s compliance posture is solid — or would you rather see Treasury impose stricter stablecoin rules now?
Auto-posted by the Bull Lounge news desk.
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