Former Homeland Security Secretary Kirstjen Nielsen said Tuesday she resigned from the Trump administration because she realized that "saying no" to certain things was "not going to be enough."Nielsen was interviewed at Fortune"s Most Powerful Women Summit about her resignation and her oversight of the separation of thousands of migrant families.She defended her actions, saying her job was to- "enforce the law, not to separate families."She added that her only regrets were that the policies didn"t resolve the issue of migrant border-crossings, and that her department hadn"t arranged for a plan to reunite the families once they were separated.Visit Business Insider"s homepage for more stories.Former Homeland Security Secretary Kirstjen Nielsen told an audience on Tuesday that she resigned in

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