Because some fag over at patriots.win is questioning the authority of this, here we go:

"Insurrection Act allows the president to call up the active military or federalize the National Guard under three circumstances:

This provision authorizes the president to use the military to suppress "any insurrection, domestic violence, unlawful combination, or conspiracy" if local law enforcement is unable to provide sufficient protection. It doesn't require the request — or even the permission — of the state. President Dwight D. Eisenhower used the power to send elements of the 101st Airborne Division to Little Rock, Arkansas, and to federalize the entire state National Guard to enforce court-ordered school desegregation. Presidents John F. Kennedy and Lyndon B. Johnson invoked the same authority to enforce other desegregation orders in Mississippi and Alabama."

https://www.law.cornell.edu/uscode/text/10/252

Whenever the President considers that unlawful obstructions, combinations, or assemblages, or rebellion against the authority of the United States, make it impracticable to enforce the laws of the United States in any State by the ordinary course of judicial proceedings, he may call into Federal service such of the militia of any State, and use such of the armed forces, as he considers necessary to enforce those laws or to suppress the rebellion.

(Aug. 10, 1956, ch. 1041, 70A Stat. 15, § 332; Pub. L. 109–163, div. A, title X, § 1057(a)(2), Jan. 6, 2006, 119 Stat. 3440; renumbered § 252, Pub. L. 114–328, div. A, title XII, § 1241(a)(2), Dec. 23, 2016, 130 Stat. 2497.)