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reputation as one of the most aggressive enforcers of immigration law in recent American history.His record belies the short length of his tenure.In six months, Kelly eliminated guidelines that governed federal immigration agents' work; vastly expanded the categories of immigrants being targeted for deportation; threatened to abandon the Obama-era program that grants legal status to undocumented immigrants who were brought to the U.S. as children; and has even broached the idea of splitting up mothers and children at the border to "deter" people from coming to the U.S.