Sen. Elizabeth Warren has pressed the U.S. Commerce Department for answers about how it is handling reported national security concerns related to Bitmain, the China-based maker of a large share of the world’s Bitcoin mining rigs. Her inquiry adds fresh political attention to an issue that has been simmering in the U.S. for months: the security and supply-chain risks tied to foreign-made crypto-mining equipment.
Warren’s office told Bloomberg she sent a letter on Thursday to Commerce Secretary Howard Lutnick requesting documents and communications about Bitmain and any steps the department has taken to address “potential national security concerns.” The senator specifically asked whether political influence has played a role in Commerce’s approach.
Background: unresolved federal review and earlier probes
- The Department of Homeland Security launched a probe called Operation Red Sunset to determine whether Bitmain machines could be exploited for espionage or sabotage—examining risks such as remote access or other ways the devices might threaten U.S. systems.
- A separate federal review in May 2024 flagged “national security concerns” after Bitmain equipment was used near a U.S. military base. That national-security inquiry remains unresolved, and such investigations can continue for years without a public enforcement action.
Why scrutiny has broadened
- Market concentration in ASIC mining hardware is extreme: Cambridge’s Digital Mining Industry Report estimates the top three manufacturers control over 99% of the market, and the single largest vendor holds about 82%—a dynamic that raises systemic risk questions.
- Enforcement and trade moves have amplified scrutiny: in February 2025, U.S. miners experienced delivery delays after customs examined Bitmain shipments. TSMC reportedly stopped shipments to Sophgo, a chip-design firm linked to Bitmain, after a chip associated with Huawei was discovered; Sophgo was later added to a U.S. trade blacklist.
Bitmain’s U.S. ties and political sensitivity
- Scrutiny has expanded beyond hardware to encompass Bitmain’s broader business connections. Notably, Bitmain has commercial ties to American Bitcoin, a U.S. mining company backed by Eric Trump and Donald Trump Jr.; filings show American Bitcoin agreed to buy 16,000 Bitmain rigs for $314 million.
- Warren’s letter asks for information on any communications involving Bitmain, Commerce officials, and interests tied to the Trump family.
Meanwhile, Bitmain has been moving to increase its U.S. footprint. In July 2025 the company announced plans for its first U.S.-based manufacturing site, targeting initial output in early 2026 and a larger ramp later in the year. That expansion is unfolding against the backdrop of an unresolved federal review and renewed political scrutiny in Washington.
What to watch
- Any documents or responses from Commerce could clarify whether the department has taken concrete steps on national-security findings and whether political considerations influenced decision-making.
- Updates on the DHS review, trade actions involving Sophgo or Bitmain, and progress on Bitmain’s planned U.S. manufacturing will determine how quickly regulators and industry stakeholders move to address these supply-chain and security questions.
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