A group of migrants mainly from Venezuela wade through the Rio Grande as they cross the U.S.-Mexico border, Wednesday, June 16, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

A migrant changes to dry clothing after wading through the Rio Grande and crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

A group of migrants look to turn themselves in after wading through the Rio Grande and crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. Unlike the farmers and low-wage workers who come from Mexico or Central America, the Venezuelans are often bankers, doctors and engineers. They're fleeing turmoil in the country with the world's largest oil reserves and pandemic-induced pain across South America. (AP Photo/Eric Gay)

A group of migrants wait with Border Patrol after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

Migrants who crossed the U.S.-Mexico border illegally and turned themselves in receive assistance at a respite center, Wednesday, June 16, 2021, in Del Rio, Texas. Last month, more than 7,000 Venezuelans were encountered along the U.S.-Mexico border, more than all previous 14 years on record combined. (AP Photo/Eric Gay)

A group of migrants wait with Border Patrol after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. Unlike the farmers and low-wage workers who come from Mexico or Central America, the Venezuelans are often bankers, doctors and engineers. They're fleeing turmoil in the country with the world's largest oil reserves and pandemic-induced pain across South America. (AP Photo/Eric Gay)

A group of migrants walk across the Rio Grande on their way to turn themselves in upon crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. U.S. government data shows that 42% of all families encountered along the border in May hailed from places other than Mexico, El Salvador, Guatemala and Honduras — the traditional drivers of migratory trends. (AP Photo/Eric Gay)

A group of migrants, mostly from Venezuela are photographed after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Many of the migrants cross during daylight, looking to turn themselves in to Border Patrol agents who document their arrival. (AP Photo/Eric Gay)

Sarai Galván, a migrant from Venezuela, waits to board a van at a respite center she crossed the U.S.-Mexico border and turned herself in and was released, Friday, June 17, 2021, in Del Rio, Texas. The increased number of Venezuelan migrants is a harbinger of a new type of migration that has caught the Biden administration off guard: pandemic refugees. (AP Photo/Eric Gay)

Migrants from Venezuela looks out from a Border Patrol transport vehicle after they crossed the U.S.-Mexico border and turned themselves in, Wednesday, June 16, 2021, in Del Rio, Texas. Last month, more than 7,000 Venezuelans were encountered along the U.S.-Mexico border, more than all previous 14 years on record combined. (AP Photo/Eric Gay)

Migrants who crossed the U.S.-Mexico border and turned themselves look to purchase bus tickets at a respite center after their release, Friday, June 17, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

A migrant from Venezuela holds a bag of personal items as she waits with others after they crossed the U.S.-Mexico border and turned themselves in, Wednesday, June 16, 2021, in Del Rio, Texas. Last month, more than 7,000 Venezuelans were encountered along the U.S.-Mexico border, more than all previous 14 years on record combined. (AP Photo/Eric Gay)

Migrants who entered the United States illegally and turned themselves sit on a bus after they were processed by U.S. Customs and Border Patrol, Monday, June 14, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. Unlike the farmers and low-wage workers who come from Mexico or Central America, the Venezuelans include bankers, doctors and engineers. (AP Photo/Eric Gay)

A migrant family from Venezuela move to Border Patrol transport vehicle after they and other migrants crossed the U.S.-Mexico border and turned themselves in Wednesday, June 16, 2021, in Del Rio, Texas. Last month, more than 7,000 Venezuelans were encountered along the U.S.-Mexico border, more than all previous 14 years on record combined. (AP Photo/Eric Gay)

Yahehy Padilla, center, from Venezuela, and other migrants who entered the United States illegally and turned themselves in board a bus after they were processed by U.S. Customs and Border Patrol, Monday, June 14, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

Migrants sit in a Border Patrol transport van after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. (AP Photo/Eric Gay)

A young migrant girl from Venezuela stands with her mother as they wait with Border Patrol after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. They're fleeing turmoil in the country with the world's largest oil reserves and pandemic-induced pain across South America. (AP Photo/Eric Gay)

Lis Briceno of Venezuela purchases a bus ticket as she waits with other immigrants at a respite center after turning themselves in after crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. Record numbers of Venezuelans are crossing the U.S.-Mexico border as overall migration swells. "I always thought I'd come here on vacation, to visit the places you see in the movies," Briceno said. "But doing this? Never." (AP Photo/Eric Gay)

Marianela Rojas, right, and Darcy Medina, second from right, pray and cry after turning themselves in after crossing the U.S.-Mexico border Tuesday, June 15, 2021, in Del Rio, Texas. Two days after The Associated Press witnessed Rojas' dramatic crossing, she was out of detention and rushing to catch a bus out of town. Between frantic phone calls from a shelter to loved ones unaware of her whereabouts, the 54-year-old recounted how a few years ago she was forced to flee hardship in western Venezuela, leaving behind a paid-off home and once solid career as an elementary school teacher for a fresh start in Ecuador. (AP Photo/Eric Gay)

Migrants stand stand in line at a respite center after they crossed the U.S.-Mexico border and turned themselves in and were released, Wednesday, June 16, 2021, in Del Rio, Texas. Last month, more than 7,000 Venezuelans were encountered along the U.S.-Mexico border, more than all previous 14 years on record combined. (AP Photo/Eric Gay)

A Border Patrol agent watches as a group of migrants walk across the Rio Grande on their way to turn themselves in upon crossing the U.S.-Mexico border, Tuesday, June 15, 2021, in Del Rio, Texas. U.S. government data shows that 42% of all families encountered along the border in May hailed from places other than Mexico, El Salvador, Guatemala and Honduras — the traditional drivers of migratory trends. (AP Photo/Eric Gay)