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U.S. homeland security secretary explains how authorities would prevent more future deadly smuggling episodes

On Sunday’s episode of CBS' "Face the Nation," U.S. Homeland Security Sec. Alejandro Mayorkas discussed immigration, including the recent deadly episode of human-smuggling when dozens of migrants were found dead in a tractor-trailer in San Antonio, Texas. Mayorkas emphasized several government security and immigration agencies in conjunction with foreign governments were working to ensure that those responsible were brought to justice and another tragedy like this never occurs again.