Boston Mayor Michelle Wu is preparing for the president to possibly deploy the National Guard to Boston, though she didn't signal any immediate knowledge of a deployment during a public radio appearance Tuesday.

"We are following what's happening in other cities around the country very closely. Unfortunately, we have seen a little bit of what it would look like if that should come to pass, and that this federal administration is willing to go beyond the bounds of constitutional authority," Wu said on GBH's " Boston Public Radio ."

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In recent weeks, President Donald Trump has threatened to broaden deployments of National Guard units and federal agents in major U.S. cities. On Aug. 11, he declared a "crime emergency

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