The plaintiffs say a deployment would violate the U.S. Constitution as well as a federal law that generally prohibits the military from being used to enforce domestic laws. The lawsuit argued that Mr. Trump lacks the authority to federalize the National Guard. He added: "Members of the Oregon National Guard are not a tool for him to use in his political theater." Mr. Trump deployed the National Guard and active-duty Marines to Los Angeles over the summer and as part of his law enforcement takeover in the District of Columbia. Last month, Mr. Trump signed a presidential memorandum mobilizing federal law enforcement agents to Memphis, Tennessee, at the request of the Tennessee governor.