Kevin McAleenan, the acting secretary of the Department of Homeland Security, tells Sharyn Alfonsi that he regrets losing the public's trust over the separation of families at the U.S-Southern border. For the first time in decades, the United States sent a carrier strike group north of the Arctic Circle, to participate in the war games. David Martin was there. And how did fentanyl make its way into the United States? Scott Pelley investigates on this week's "60 Minutes."

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