John Sanders, acting commissioner of the Customs and Border Protection agency, will leave his post in the coming weeks in the wake of reports of migrant children at the border being held in unsafe and unsanitary conditions.
His resignation comes amid increasing public furor over the treatment of detained migrant kids after lawyers reported some of the older children were caring for toddlers at a facility in Clint, Texas, and they didn't have adequate food, water and sanitation.
Sanders, who has overseen the agency responsible for border enforcement, said his resignation is effective July 5.
"Although I will leave it to you to determine whether I was successful, I can unequivocally say that helping support the amazing men and women of CBP has been the most fulfilling and satisfying opportunity of my career," Sanders said in his resignation letter.
An official from CBP said Tuesday that the agency moved more than 100 children back to the Clint facility. The official said the "majority" of the roughly 300 children detained there last week have been placed in facilities operated by the Office of Refugee Resettlement.
The official, who briefed reporters on the condition of anonymity, said Clint is better equipped than some of the Border Patrol's tents to hold children.
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Six children have died since late last year after being detained by CBP, the agency that apprehends and first detains migrant parents and children crossing the U.S.-Mexican border illegally.
Sanders pushed Congress to pass $4.5 billion in humanitarian funding. In an interview last week with The Associated Press, he talked about how the deaths "impacted him profoundly."
Contributing: The Associated Press
This article originally appeared on USA TODAY: Acting Customs and Border Protection commissioner to leave as immigration tensions escalate