MSNBC's Chris Hayes unrelentingly spars with GOP lawmaker over immigration, demands 'evidence' that migrants are 'posing' as families

MSNBC's Chris Hayes insisted that Rep. Roger Marshall (R-Kan.) cite his sources on Thursday when the lawmaker doubled-down on his unproven allegation that terrorists and cartel members are "posing as families … trying to cross our borders."

The tense exchange began after Hayes told Marshall, "we've interviewed mothers from Guatemala and Honduras whose sons have been killed by drug cartels who have fled 1,000 miles north risking everything. Are they a national security threat?" Marshall replied by citing a statistic also used frequently by the administration: That immigrants falsely posing as family members have tripled at the border (Marshall claims it's "quadrupled" in speaking with Hayes).

The data being cited, though, "reflects a period of less than two years, making it difficult to draw a meaningful historical comparison," writes The New York Times. "And the instances of fraud make up less than 1 percent of families apprehended at the border." That's part of why Hayes later interrupts to say: "You keep using the word 'posing' … you keep implying that these people are making up stories, that 5-year-olds have been coached, that they've been taken by traffickers. What I'm asking you is to present evidence that that is happening in any systemic way."

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Watch the entire exchange, and Marshall's response, below. Jeva Lange

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