The Blumenthal Tether inquiry is now official paper: Senator Richard Blumenthal sent letters to Tether CEO Paolo Ardoino and to Nxum Group on October 22, requesting records tied to the firm co-founded by former White House crypto adviser Bo Hines. Both letters carry a November 3 response deadline.
The requests are voluntary – not subpoenas – but they are unusually specific. Blumenthal wants contracts, payment details, crypto wallet addresses and lobbying communications involving Nxum, Hines and related parties.
What triggered the letters
The immediate basis is a Wall Street Journal investigation reporting that Tether entered a roughly $6.3 million arrangement with Nxum in May 2025 for a "strategic brand and public affairs plan." Per that reporting, payments began while Hines was still helping shape stablecoin policy at the White House and continued after he left to join Tether in August 2025. We covered the original Journal piece when it landed; this Blumenthal Tether inquiry is the formal follow-up.
Blumenthal, the ranking member of the Senate Permanent Subcommittee on Investigations, spelled out three concerns in his letters:
- Hines allegedly kept an approximately one-third ownership stake in Nxum while serving in the White House, even as the firm was paid by a stablecoin issuer;
- Tether allegedly coordinated Nxum’s lobbying against the GENIUS Act, with Ardoino once telling Nxum to "obliterate" the legislation’s opponents;
- The "highly unusual terms and nature" of the Tether-Nxum relationship overall.
Tether’s side
Neither Tether nor Nxum admits wrongdoing. Both have pointed to internal investigations and recusal protocols, and both dispute the allegations underlying the letters. Blumenthal framed the probe as part of a broader look at what he called the Trump administration’s "self-enrichment and self-dealings with cryptocurrency firms."
Why November 3 matters
The deadline gives both parties a fortnight to produce documents voluntarily. A refusal, a partial production or a detailed response will each tell a different story about how seriously Washington’s stablecoin conflicts debate has become. For now, the Blumenthal Tether inquiry is a request, not a finding – but requests have a way of becoming hearings.
