U.S. President Donald Trump on Tuesday suggested using American cities as military "training ground," the latest example of the president's willingness to use the might of the nation's armed forces on the home soil of his choosing.

Addressing hundreds of U.S. military generals and admirals flown in for the speech, Trump said the U.S. military should be used to control what he described as "the invasion from within" rather than abroad.

"It seems that the ones that are run by the radical left Democrats, what they've done to San Francisco, Chicago, New York, Los Angeles, they're very unsafe places. And we're going to straighten them out one by one," Trump said in an auditorium in Quantico, Va. The military personnel, apolitical by custom, did not respond or applaud as the president spoke.

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