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Detainees sleep in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A young boy walks over to use the toilet while in his holding area where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

A U.S. Customs and Border Protection officer helps out a few boys who are trying to make phone calls as they are joined by hundreds of mostly Central American immigrant children that are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

A toddler sits on the floor with other detainees at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees watch a World Cup soccer match from a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Two young girls watch a World Cup soccer match on a television from their holding area where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( APTOPIX Immigration Overload )

Young boys sleep in a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

U.S. Customs and Border Protection agents work at a processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A toddler sits on the floor with other detainees at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A detainee is seen through the door of a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees sleep in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees sleep and watch television in a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Cloths for detainees are sorted at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees wait at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Hundreds of mostly Central American immigrant children are separated into age and gender holding areas as they are being processed and held at the U.S. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Detainees walk in a line at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees play as other sleep in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

U.S. Customs and Border Protection agents work at a processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Young boys sleep in a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Detainees are escorted to an area to make phone calls as hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Detainees do art work under a camouflage tent at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees, with the shoe strings removed, wait at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A young boy shoots the basketball at a makeshift hoop in a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

A few boys try to make calls as they are joined by hundreds of mostly Central American immigrant children that are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

Cloths for detainees are sorted at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees wait at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

U.S. Customs and Border Protection operations officer Mark Qualia talks about how detainees have their belongings kept where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

U.S. Customs and Border Protection agents work at a processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees wait in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A detainee looks through the door of a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A detainees sleep in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees, with the shoe strings removed, wait at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A young boy bows his head in a holding cell where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( APTOPIX Immigration Overload )

Cloths for detainees are sorted at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees color and draw at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

A make-shift laundry room is seen at a U.S. Customs and Border Protection processing facilities, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( txeg133.jpg )

A detainee sits in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

U.S. Customs and Border Protection agents work at a processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

The outside of the U.S. Customs and Border Protection Nogales Placement Center where hundreds of mostly Central American immigrant children are being processed and held on Wednesday, June 18, 2014, in Nogales, Ariz. (AP Photo/Ross D. Franklin, Pool) ( Immigration Overload )

A sleeping detainee is seen through the window of holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Detainees sleep in a holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Cloths for detainees are sorted at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

U.S. Customs and Border Protection agents work at a processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )

Sleeping detainees are seen through the window of holding cell at a U.S. Customs and Border Protection processing facility, Wednesday, June 18, 2014, in Brownsville,Texas. (AP Photo/Eric Gay, Pool) ( Immigration Overload )