Mexico

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Members of the group Border Dreamers and other supporters of an open border policy march toward the United States border where some plan to ask for asylum Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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A young girl rides in a bus upon its arrival near the United States border for a march of the group Border Dreamers and other supporters of an open border policy Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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United States Customs and Border Protection officers block entry lanes into the United States as the group Border Dreamers and other supporters of an open border policy march toward the United States border Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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Estella Jimenez, of the group Border Angels, leads a chant for members of the group Border Dreamers and other supporters of an open border policy just outside the port of entry into United States Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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Angelica Lopez holds the hand of her son, Osmar, and daughter, Ashley, as they march with the group Border Dreamers and other supporters of an open border policy toward the United States border where some plan to ask for asylum Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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Demonstrators supporting the group Border Dreamers and other advocates for an open border policy hold signs while lining a walking bridge inside United States behind Customs and Border Protection officers who are blocking the vehicle entrance to the United States Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi )

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Daniel Rodriguez holds three-year-old Matthew Huert as he leads a chant for members of the group Border Dreamers and other supporters of an open border policy who marched to the United States border Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)

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Jaren Rodriguez leads a line of members of the group Border Dreamers and other supporters of an open border policy as they march toward the United States border where some plan to ask for ayslum Monday, March 10, 2014, in Tijuana, Mexico. (AP Photo/Lenny Ignelzi)