President Donald Trump is threatening to send National Guard troops into major American cities, including New York, to quell violence and potential civil disturbances.

But Gov. Kathy Hochul and NYPD Commissioner Jessica Tisch have argued that deploying the National Guard — as Trump did in Washington, D.C., after declaring a "crime emergency" — in New York is unnecessary .

Here's everything you need to know about what Trump is considering, and what city and state officials could do to stop him.

What is the National Guard and what do they typically do?

The National Guard is the primary combat reserve of the Army and Air Force, comprising more than 430,000 civilian soldiers who can respond to both domestic crises, such as natural disasters, and overseas conflicts, such as Afghanistan.

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