Can the U.S. government legally gatekeep global access to AI models?

The U.S. Commerce Department recently ordered Anthropic to block foreign nationals from using its advanced AI models, citing national security concerns. This move effectively made the company's top models inaccessible to everyone, including its own noncitizen employees. This action raises questions about the U.S. government's role in regulating global access to AI technologies and the implications for international collaboration and competition in the AI field. It underscores the tension between national security interests and the global nature of tech development.