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.”
Marc Rosenblum, the former executive director of the Office of Homeland Security Statistics, wrote in a public LinkedIn post on Saturday that he was “sad, and thrilled, to say that yesterday was my last day working at DHS.”
Rosenblum joined the Office of Immigration Statistics in 2016, and said he watched the team grow from a “scrappy team of 11” to a staff of 45 prior to Trump’s second term. 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.”
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A representative for DHS told NOTUS that while the department does not comment on personnel decisions, “people are always welcome to their opinion — that doesn’t make it right or factual.” The White House declined to comment.
The Trump administration launched expanded immigration enforcement efforts at the beginning of the president’s second term, but critics on both sides of the aisle have requested better data on the impact of those efforts.
Immigration and Customs Enforcement did not release data on either detentions or deportations from April 9 until July 24, 2026, missing multiple semimonthly “Detention Management” reports that typically include arrests, detentions and deportations, according to The Marshall Project.
Rosenblum did not address the data-sharing lapses explicitly in his resignation letter — though he described a “challenging and often hostile work environment” that he and others allegedly experienced at DHS.
Multiple organizations have taken legal action against the Trump administration, seeking data on immigration enforcement and detention practices.
The Oversight Project, a conservative-leaning advocacy group, filed a lawsuit this month against DHS to release the updated data. American Oversight, a nonpartisan watchdog group, filed a lawsuit against the department in June seeking records relating to deaths in immigration custody.
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