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Mamdani probably does not understand precedent:

Alabama Governor George Wallace had campaigned on a platform of "segregation now, segregation tomorrow, segregation forever." When federal court orders required the University of Alabama to admit Black students, Wallace vowed to stand physically in the doorway to block their enrollment.

On June 11, 1963, two Black students—Vivian Malone and James Hood—attempted to register at the university. Wallace positioned himself in the doorway of the auditorium in a dramatic (but ultimately symbolic) gesture of defiance. US troops were dispatched when the federal government made clear it would enforce the court's desegregation order:

Deputy U.S. Marshal Nicholas Katzenbach arrived to negotiate with Wallace
Alabama National Guard troops (placed under federal command by President Kennedy) were deployed
Federal marshals and troops made it clear they would enforce desegregation

Wallace eventually stepped aside—his confrontation lasted only a few hours. The students were allowed to register, and desegregation proceeded. The event:

Demonstrated federal authority over state resistance to civil rights
Showed Wallace's defiance was theatrical but ultimately futile
Was a pivotal moment in forcing Southern school desegregation
Led to Kennedy's major civil rights address that evening and the introduction of comprehensive civil rights legislation

I can see Mamdani triggering a similar showdown, Trump dispatching federal troops, nationalizing the NYS Guard, enforcing federal immigration law, and showing Mamdani is nothing but theater.