New 9/11 documents renew focus on survivors' health

As America marks 25 years since the 9/11 attacks, new documents renew focus on the persistent health issues suffered by survivors and first responders in New York. Plus, national security experts warn the Department of Homeland Security, created in response to the attacks, is diverting resources into President Trump's immigrations crackdown. Ken Dilanian, Karen Greenberg, David Rohde, and Paul Rieckhoff join Ali Velshi on The 11th Hour.