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The Department of Homeland Security's top data official resigned earlier this month, becoming one of the very few federal officials to publicly criticize the Trump administration's immigration crackdown on his way out.Marc Rosenblum, who served as executive director of the Office of Homeland Security Statistics and deputy assistant secretary at DHS, announced his departure in a LinkedIn post over the weekend. "I'm thrilled to end my relationship with the current administration," he 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." Rosenblum's office was responsible for consolidating data across all 22 DHS component agencies, tracking everything from deportations and Border Patrol encounters to cybersecurity intrusions and trafficking investigations, Wired reported. The office peaked at 45 staff during the Biden years. Its public-facing website on ICE detentions, Border Patrol encounters, and DHS repatriations has not been updated since February 11, 2025, weeks into Trump's second term. What data has emerged since then, often through Freedom of Information Act lawsuits, has been described by analysts as inconsistent and unreliable. "There's no accountability, no way to assess, no public understanding about what's really going on that is not curated by a press release from the agency," David Bier of the Cato Institute told NOTUS.Rosenblum is not a new voice on immigration enforcement. In 2015 testimony before a Senate committee, he warned that mass deportation would be counterproductive, expensive, and damaging to the economy. He estimated that deporting all unauthorized immigrants would cut the US workforce by 6.4% and reduce GDP by $1.6 trillion.