Anthropic Sues Pentagon Over National‑Security Blacklist as Judge Lin Calls Trump‑Ordered Ban 'Troubling' and Poorly Tailored
Anthropic sued the Pentagon seeking to pause and roll back a Trump‑era blacklist and supply‑chain‑risk designation, arguing public statements and actions have created profound uncertainty and asking the court to restore the status quo as of Feb. 26. At a March 24 hearing, U.S. District Judge Rita Lin called the Pentagon’s measures “troubling” and not well tailored—questioning why the department wouldn’t simply stop using Claude if worried about chain‑of‑command integrity and saying she was surprised the government argued public posts aren’t legally binding—while the Pentagon says Anthropic is effectively seeking an “operational veto,” contends the company controls Claude’s availability, and warns its negotiating stance raises risks of future sabotage.
📌 Key Facts
- At a March 24 hearing, U.S. District Judge Rita Lin called the Pentagon’s actions against Anthropic “troubling,” saying they “don't really seem to be tailored to the stated national security concern” and remarking, “I don't know if it's murder, but it looks like an attempt to cripple Anthropic.”
- Lin criticized three Trump‑era measures — former President Trump's public ban on Anthropic, Defense Secretary Pete Hegseth’s demand that Pentagon contractors cut commercial ties, and the Pentagon’s supply‑chain‑risk designation — as poorly tailored and suggested the Defense Department could simply stop using Anthropic’s Claude model itself rather than broadly excluding the company.
- The government told the court that Trump and Hegseth’s blacklist social‑media posts are not legally binding, an argument the judge found “pretty surprising” because those statements are central to the lawsuit; DOJ attorney Eric Hamilton also conceded the supply‑chain‑risk label does not legally bar defense contractors from using Anthropic for non‑military work and said he knew of no law allowing DoD to cut off all commercial activity with the company.
- Anthropic is seeking preliminary relief to restore the status quo as of Feb. 26: pausing the supply‑chain designation, blocking its enforcement, and rolling back actions already taken against the company.
- The Pentagon argues Anthropic is seeking an “operational veto” over Defense Department decisions and contends Anthropic retains control over Claude’s availability and performance in ways that could be dangerous for sensitive operations; Anthropic disputes that characterization.
- In court the government justified the supply‑chain‑risk designation by saying Anthropic’s negotiating stance created a risk of future sabotage — including worries about a hidden “kill switch” — a rationale Judge Lin questioned as potentially punishing the firm for being “stubborn” and “ask[ing] annoying questions.”
- Anthropic’s lawyer Michael Mongan told the judge that Hegseth’s widely viewed social‑media post has created “profound uncertainty” for the company and denied that Anthropic can alter or shut off Claude once it is deployed on government systems.
📰 Source Timeline (3)
Follow how coverage of this story developed over time
March 24, 2026
11:46 PM
Judge calls Pentagon's moves against AI firm Anthropic "troubling"
New information:
- Judge Rita Lin explicitly called the Pentagon’s actions against Anthropic 'troubling' and said they 'don't really seem to be tailored to the stated national security concern.'
- Lin suggested the Defense Department could simply stop using Claude itself instead of broadly designating Anthropic a supply‑chain risk and moving to cut it out of military contracting.
- Under questioning, DOJ attorney Eric Hamilton conceded that the supply‑chain‑risk label does not legally bar defense contractors from using Anthropic on non‑military work and said he knew of no law allowing DoD to cut off all commercial activity with Anthropic, undercutting Defense Secretary Pete Hegseth’s public threat.
- Anthropic’s lawyer Michael Mongan argued that Hegseth’s widely viewed social‑media post has created 'profound uncertainty' for the company, even if the government now says it is not enforceable, and denied that Anthropic can alter or shut off Claude once it is deployed on government systems.
- The government justified the 'supply chain risk' designation in court by claiming Anthropic’s negotiating stance created a 'risk of future sabotage,' including fears of a hidden 'kill switch,' while Lin questioned whether that amounted to punishing the firm for being 'stubborn' and 'ask[ing] annoying questions.'
9:11 PM
Judge questions Pentagon's "troubling" Anthropic actions
New information:
- At a March 24 hearing, U.S. District Judge Rita Lin called the Pentagon’s treatment of Anthropic 'troubling' and said, 'I don't know if it's murder, but it looks like an attempt to cripple Anthropic.'
- Judge Lin criticized three Trump‑era actions — Trump’s ban on Anthropic, Defense Secretary Pete Hegseth’s requirement that Pentagon contractors cut commercial ties, and the supply‑chain‑risk designation — as not well tailored to the stated national‑security concern, noting the Pentagon could simply stop using Claude if the issue were chain‑of‑command integrity.
- The Pentagon’s lawyer argued that Trump and Hegseth’s blacklist social‑media posts are not legally binding, an argument the judge said she found 'pretty surprising' because the statements are 'front and center' in the lawsuit.
- Anthropic is asking the court for preliminary relief that would effectively restore the status quo as of Feb. 26 — before the public blacklist announcements — by pausing the designation, blocking enforcement, and rolling back actions already taken.
- The Pentagon argues in filings that Anthropic is seeking an 'operational veto' over Defense Department decisions and says Anthropic has full control over Claude’s availability and performance in ways it views as dangerous in sensitive operations, a characterization the company disputes.