Whistleblower: US violates international law by sending asylum seekers to Mexico

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Many people seeking asylum at the southern U.S. border are being sent back to Mexico, where they face violence from both cartels and security forces. A whistleblower from the U.S. Immigration and Customs Enforcement tells Alex Witt that the U.S. is violating the law by sending people with viable asylum claims back to a country where they are not safe.