New DHS Sec. Markwayne Mullin testifies in DC
New DHS Sec. Markwayne Mullin testifies in DC

New DHS Sec. Markwayne Mullin testifies in DC

As immigration protests get heated in parts of the country, so are tempers on Capitol Hill, as Homeland Security Secretary Markwayne Mullin testifies over his agency's handling of immigration enforcement efforts. Reporter Caroline Elliott has more.

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