AI 说：联邦政府回应州政府请求而部署国民卫队是惯例，而不是法律规定。（见跟帖内容）

Question: Does the federal government need permission from states to deploy National Guard?

AI: No, the federal government does not automatically require permission from states to deploy the National Guard in federal service. However, the federal government is generally required to request a governor's consent to federalize the National Guard for a specific purpose, unless federal law specifically authorizes the deployment of federal troops without that consent.