Legal advocates and attorneys general argue practice poses accountability issues and contributes to a climate of fear

The head of US Immigration and Customs Enforcement (Ice) said on Sunday that he will continue allowing the controversial practice of his officers wearing masks over their faces during their arrest raids.

As Donald Trump has ramped up his unprecedented effort to deport immigrants around the country, Ice officers have become notorious for wearing masks to approach and detain people, often with force. Legal advocates and attorneys general have argued that it poses accountability issues and contributes to a climate of fear.

On Sunday, Todd Lyons, the agency’s acting director, was asked on CBS Face the Nation about imposters exploiting the practice by posing as immigration officers. “That’s one of our biggest concerns. And I’ve said it publicly before, I’m not a proponent of the masks,” Lyons said.