Senate Democrat Probes Cantor Fitzgerald Over Tether Partnership and Lutnick Fam ...

Senator Richard Blumenthal sent a formal letter on Thursday to Cantor Fitzgerald chairman Brandon Lutnick, demanding records on the firm's financial relationship with stablecoin issuer Tether and pressing for details on how much Commerce Secretary Howard Lutnick and his family have earned from that arrangement. The inquiry, from the ranking Democrat on the Senate Permanent Subcommittee on Investigations, escalates congressional scrutiny of a business partnership that sits at the intersection of regulated finance, digital assets, and US sanctions law.

What Blumenthal Is Asking

The letter requests all communications involving Howard Lutnick about Tether — including those sent after he left Cantor — along with earnings and compliance records, the terms of his divestiture from the firm, and details of any loans or financing Tether may have provided to the Lutnick family to facilitate the transfer of ownership to his sons. Blumenthal has also asked whether Cantor requires independent audits of Tether's reserves, whether it has ever considered ending the partnership, and what steps it has taken to investigate allegations of illicit finance and sanctions evasion. Cantor has until October 23 to respond.

Blumenthal's central charge is that Cantor's commercial interests have compromised its role as a compliance gatekeeper.

"Disturbingly, Cantor Fitzgerald's lucrative business arrangements with Tether come at the expense of America's national security,"

he wrote. Neither Cantor Fitzgerald nor Tether had responded to requests for comment at the time of publication.

The Cantor–Tether Relationship

Cantor Fitzgerald began acting as a custodian for a portion of the US Treasury bills backing Tether's reserves in 2021. A stablecoin like Tether's $USDT is a digital token pegged to the US dollar; the issuer is supposed to hold equivalent dollar-denominated assets — in Tether's case, largely US Treasury bills — to back every token in circulation. Cantor holds tens of billions of dollars of those reserves on Tether's behalf, making it a critical link in the stablecoin's financial infrastructure.

In April 2024, Cantor acquired rights to a 5% stake in Tether itself. Blumenthal's letter alleges that the estimated value of that stake climbed from $600 million to $10 billion after President Trump returned to office, and that Howard Lutnick received more than $250 million during that period, including a $192 million distribution from Cantor Fitzgerald. These figures come from Blumenthal's letter and have not been independently verified. Howard Lutnick stepped down from Cantor when the Senate confirmed him as Commerce Secretary in February 2025; the firm subsequently named his son Brandon chairman and another son vice chairman.

The Iran Allegations and Tether's Response

The letter follows a report published last month by Democratic investigators on the same subcommittee alleging that Tether's $USDT has become a significant tool in Iran's shadow banking network — informal financial channels used to move money outside the reach of the formal banking system and US sanctions. Blumenthal has called on the Treasury Department and the Justice Department to investigate potential sanctions violations.

Tether pushed back with a statement saying it has cooperated with law enforcement for years and has frozen nearly $550 million in Iran-linked $USDT in 2026 alone. The company also notes that it claims to operate out of El Salvador, though Blumenthal's letter points out that the vast majority of its assets sit in the United States under Cantor's custodianship — a detail that may bear on which regulators have jurisdiction.

Broader Stakes for Stablecoin Regulation

The probe arrives as Congress is actively debating how to regulate stablecoins and the broader digital asset industry. Blumenthal framed the Cantor-Tether partnership as a window into how the sector actually operates: "As Congress considers how to best regulate digital assets, your partnership with Tether will provide important insights into the inner workings of this industry," he wrote.

As a minority-party senator, Blumenthal's letter carries political weight but no subpoena power — meaning Cantor is not legally compelled to produce the requested documents. That calculus could shift after November's elections. Prediction markets currently place the probability of Democrats winning a Senate majority at roughly 61–64%, which would give the subcommittee's Democratic members the authority to compel testimony and records.

For the broader crypto market, the investigation highlights a tension that stablecoin legislation will eventually have to resolve: how to ensure that the custodians and investors who underpin dollar-pegged tokens are subject to the same sanctions-compliance obligations as traditional banks, particularly when those custodians have direct ties to senior government officials.