A police union boss urged members to put politics aside and “stand shoulder-to-shoulder” with Immigration and Customs Enforcement agents during raids expected on Sunday in cities across the country, according to the letter released Saturday

“[ICE] will be apprehending individuals who are criminally wanted for crimes committed under the United States Code of Laws,” Sergeants Benevolent Association President Ed Mullins wrote in a letter sent out Friday to union members, who are sergeants in the NYPD. “We, the members of law enforcement, do not write these laws, nor do we engage in the politics and or opinions of the laws.”

Immigrations raids targeting undocumented immigrants are expected to begin Sunday, targeting at least 2,000 immigrants in cities nationwide, according to a New York Times report.

A lawsuit filed Thursday by the American Civil Liberties Union, along with other advocacy groups, indicated the raids are meant to target undocumented immigrants facing deportation because they missed their immigration court hearings.

“I further encourage you to NOT leave any ICE Agent abandoned if in need of assistance and to stand shoulder to shoulder with each agent so that they too can return home safely to their families,” Mullins further states.

“They are members of law enforcement just like you and we must never participate in the politics being applied upon our duty to uphold the law.”