Illinois Gov. JB Pritzker on Tuesday fired back against a U.S. Department of Justice lawsuit over state protections of immigrants from federal arrest at courthouses, hospitals and day cares.

Justice officials filed suit on Monday, claiming new Illinois measures prohibiting detention of immigrants going about daily business at key locations are unconstitutional and “threaten the safety of federal officers,” according to a department statement.

Democrat Pritzker has led the opposition to the Trump administration’s crackdown on migrants in Illinois, particularly because of the indiscriminate and sometimes-violent way they’re apprehended. Through a spokesperson, he reiterated that he’s not opposed to taking action on migrants who commit violent crimes and are in the country illegally.