"""In this Oct. 21, 2018 photo, Central American migrants walking to the U.S. start their day departing Ciudad Hidalgo, Mexico. Federal immigration and health officials were blindsided by President Donald Trump's """"zero tolerance"""" policy on migrants crossing the southwest border, triggering a cascade of problems as agencies struggled with the fallout from family separations, congressional investigators said in a critical report issued Wednesday. With the White House considering tougher immigration measures as a caravan of migrants slowly heads north from Central America, the GAO report stands as a cautionary tale. (AP Photo/Moises Castillo)"""
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