A Big Tech industry group consisting of major Anthropic backers Amazon and Nvidia on Wednesday expressed concern over the Pentagon’s decision to declare the artificial intelligence company a supply-chain risk as other investors raced to contain fallout from the lab’s fight with the U.S. Defense Department.

In a letter dated Wednesday, the Information Technology Industry Council, whose members include Nvidia, Amazon, Apple and OpenAI said, “We are concerned by recent reports regarding the Department of War’s consideration of imposing a supply-chain risk designation in response to a procurement dispute.”

The letter does not name Anthropic. In recent days, CEO Dario Amodei has discussed the matter with some of Anthropic’s major investors and partners, including Amazon CEO Andy Jassy, two of the people said. Venture capital firms including Lightspeed and Iconiq have also been in contact with Anthropic executives, two sources said.