The agency said it "wants to stress the dangers of illegally crossing the border".
The Border Patrol agents said they took the necessary steps to search the camp because talks between the two sides before the raid were unsuccessful.
But for years, workers from the No More Deaths humanitarian group have attempted to prevent these tragic deaths by providing water and lifesaving medical assistance to recent crossers, without interference from federal immigration agents, "described as a "good faith agreement" by No More Deaths.
"The disregard for human life in which these persons were subjected to and the inhumane conditions that they were placed in demonstrates how callous and heartless these smugglers can be", said Laredo Sector Assistant Chief Patrol Agent Gabriel Acosta.
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"They didn't need 30 agents to apprehend four sick people", Gaffney said, adding that the agency's public relations team filmed the encounter.
Border Patrol agents descended on the medical camp set up in the Arizona desert Wednesday, June 15, 2017, to provide refuge and water for migrants in the scorching summer heat, arresting four migrants who had just crossed into the US from Mexico. Those included two individuals with "prior significant criminal records in the United States" and two needing medical care at a hospital, the agency said.
For the No More Deaths volunteers at the camp, the men were patients seeking medical help after enduring triple-digit temperatures in a trek through the desert.
About six to eight volunteers, including one doctor, were at the camp Thursday when agents arrested the four people.
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Vice President Mike Pence, who has worked with Senate Republicans for weeks on health care, also joined the lunch. At the start of the lunch, Trump told the lawmakers their healthcare bill would need to be "generous" and "kind".
No More Deaths spokeswoman Maryada Vallet said Thursday's search was the first time agents had entered the camp with a warrant.
The discovery was made on Thursday when agents questioned the driver about his immigration status. She said the group was most troubled by the fact that agents apparently had tracked the migrants for 18 or so miles (28.9 or so kilometers) but waited until they were at the camp to arrest them.
Border Patrol agents assigned at the Freer checkpoint found three people from Mexico concealed in a wooden cabinet that was inside a van. Officials say it's impossible to carry enough water to survive a desert crossing in that heat.
"This is a targeted attack that happened after a series of intensified, amplified surveillance at camp over the last 3 months under the new Trump administration", she said.
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Three U.S. soldiers were killed and another was wounded in eastern Afghanistan this weekend in an attack claimed by the Taliban. Bush's presidency - and its allies invaded Afghanistan on October 7, 2001 as part of Washington's so-called war on terror.