President Donald Trump speaks to reporters aboard Air Force One on Sunday, en route to Joint Base Andrews as he returns from a trip to Florida. Mark Schiefelbein/AP/File

President Donald Trump has made a series of inaccurate claims in recent days about the Insurrection Act, the old law he has mused about invoking to deploy troops to some US cities.

The law – more precisely described as a collection of related laws from the 18th and 19th centuries – grants presidents sweeping authority to deploy both active-duty and National Guard troops to states, if certain vague conditions are met, and to have them perform the domestic law enforcement from which the military is normally prohibited.

Trump said Sunday that if he invoked the Insurrection Act, “there’s no more court cases.” That

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