A top official at the Department of Homeland Security announced his resignation over the weekend in a blistering letter that lashed out at President Donald Trump and excoriated what he described as the administration’s “war on immigrants.” In the more than 10 years Rosenblum served at the agency, he said, his team expanded its data processing and reporting efforts. “But it will come as no surprise that I’m thrilled to end my relationship with the current administration,” Rosenblum wrote. “Between the war on immigrants, the war on feds, and the war on facts (not to mention the crazy war in Iran and the brazen corruption), I just need a change.” Multiple organizations have taken legal action against the Trump administration, seeking data on immigration enforcement and detention practices.