Central American migrants traveling with a caravan gather at the border wall, some sitting on top of it, look toward the U.S. from Mexico during a gathering of migrants living on both sides of the border, on the beach where the border wall ends in the ocean, in Tijuana, Mexico, Sunday, April 29, 2018. U.S. immigration lawyers are telling Central Americans in a caravan of asylum-seekers that traveled through Mexico to the border with San Diego that they face possible separation from their children and detention for many months. They say they want to prepare them for the worst possible outcome. (AP Photo/Hans-Maximo Musielik)

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