https://www.encyclopedia.com/social-sciences-and-law/law/law/posse-comitatus-act
"Although the president has constitutional power to use the military to protect the nation in time of emergency and to repel invasions, in the Civil Disturbance Statutes Congress expressly authorized the president to use the armed forces under emergency circumstances. Where there is an insurrection in a state against its government, the president may, in addition to calling out the militia, "use such of the armed forces as he considers necessary to suppress the insurrection." Also, the president may use the armed forces to suppress a rebellion, insurrection, domestic violence, or unlawful conspiracy that obstructs the execution of the laws of the United States or deprives the people of the United States from their constitutional rights, privileges, and immunities. These statutes were relied on to authorize the use of federal troops to enforce federal court orders for school desegregation in Arkansas (1957), Mississippi (1962), and Alabama (1963), as well as to assist the National Guard in quelling urban riots. "
Who cares? Canada is dead thanks to the thousands of Muslims Trudeau's has imported.