The United Nations Human Rights commissioner slams Trump’s “unconscionable” zero-tolerance policy, which leads to separating migrant children from their families, as an abusive practice.

Zeid Ra’ad al-Hussein spoke out against the policy during an address in Geneva, saying, “The thought that any state would seek to deter parents by inflicting such abuse on children is unconscionable,” The New York Times reports. He said the practice must stop immediately.

Hussein referenced a statement from the president of the American Association of Pediatrics, which said that separating the children from their parents was “government-sanctioned child abuse” and it could cause permanent and irreversible harm to them.

The criticism comes as the backlash over Trump’s migrant policy continues to intensify. Former First Lady Laura Bush compared Trump’s child migrant camps to Japanese American internment camps during World War II.