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FLINT, MI - JANUARY 17:  Soldiers from the Michigan Army National Guard Flint prepare to give Flint residents bottled water at a fire station January 17, 2016 in Flint, Michigan. U.S. President Barack Obama declared a federal emergency in Michigan, which will free up federal aid to help the city of Flint with lead contaminated drinking water. Michigan Gov. Rick Snyder requested emergency and disaster declarations after activating the National Guard to help the American Red Cross distribute water to residents.  (Photo by Bill Pugliano/Getty Images)
FLINT, MI - JANUARY 17:  Soldiers from the Michigan Army National Guard Flint prepare to give Flint residents bottled water at a fire station January 17, 2016 in Flint, Michigan. U.S. President Barack Obama declared a federal emergency in Michigan, which will free up federal aid to help the city of Flint with lead contaminated drinking water. Michigan Gov. Rick Snyder requested emergency and disaster declarations after activating the National Guard to help the American Red Cross distribute water to residents.  (Photo by Bill Pugliano/Getty Images)

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    Cover-up allegations in Flint water crisis

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Cover-up allegations in Flint water crisis

As protesters called for Gov. Snyder to resign over his handling of the toxic water crisis, new evidence suggests a possible cover-up. Sara Ganim reports.

Cover-up allegations in Flint water crisis

As protesters called for Gov. Snyder to resign over his handling of the toxic water crisis, new evidence suggests a possible cover-up. Sara Ganim reports.