Democratic presidential candidate Bernie Sanders has met privately with a small group of families impacted by the water crisis in Flint, Michigan.
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Speaking at a Monday rally in Ypsilanti, Michigan, the Vermont senator says it is "beyond my comprehension in the year 2016 in the United States of America we are poisoning our children."
He added that if the state and local government cannot protect children, then "the federal government better get in there."
Flint's water became tainted when the city began drawing from the Flint River in April 2014. Regulators failed to ensure the water was properly treated, and lead from aging pipes leached into the water supply.
Rival Democratic candidate Hillary Clinton recently visited Flint and on Monday announced several endorsements from ministers in the city.