Marc Rosenblum’s DHS resignation gives the Department of Homeland Security’s data fight a name and a paper trail. Rosenblum, who served as executive director of the Office of Homeland Security Statistics and as a deputy assistant secretary, said in a weekend LinkedIn post that he was ending his work with the Trump administration over what he called its “war on immigrants,” “war on feds,” and “war on facts.”
Rosenblum’s job was not ornamental. The Office of Homeland Security Statistics is the unit meant to gather and publish DHS data across a sprawling department that includes agencies handling immigration enforcement, border operations, disaster response, cybersecurity, and the Coast Guard. In plainer English: it is supposed to turn 22 component agencies’ data exhaust into numbers the public and policymakers can interrogate.
A former colleague told WIRED that Rosenblum had been tasked with pulling together data from agencies that counted and stored information in separate silos, including details such as Coast Guard interdictions and how those figures related to migration at the Southwest border.
Why did Marc Rosenblum resign from DHS?
Rosenblum pointed to policy and information control. In his LinkedIn post, he praised his colleagues at the statistics office as career civil servants producing quality work in what he described as a “challenging and often hostile work environment.” He also wrote that he needed a change from the administration’s treatment of immigrants, federal workers, and facts.
DHS did not immediately respond to WIRED’s request for comment, according to the publication. Rosenblum also did not immediately respond, WIRED reported.
The public data record helps explain why a statistics resignation is news rather than résumé trivia. The Office of Homeland Security Statistics page tracking ICE detentions, Border Patrol encounters, and DHS repatriations has not been updated since February 11, 2025, according to WIRED. Analysts have said that immigration enforcement data obtained since then, including through Freedom of Information Act litigation, has been incomplete or unreliable.
David Bier, director of immigration studies at the Cato Institute, told NOTUS in November that the lack of current public data leaves no real way to assess what is happening outside of agency-controlled press releases.
Rosenblum had worked on DHS statistics across administrations. He served in the first Trump administration and the Biden administration, first leading immigration statistics and later taking on department-wide data work. Federal News Network reported in 2023 that he said DHS would release data faster, in more detail, and across more department activities.
Luis Miranda, a top DHS spokesperson during the Biden administration, told WIRED that Rosenblum represented what Americans should expect from a career public servant. Miranda said the Trump administration had silenced or ignored facts that did not match its rhetoric, leaving transparency officials unable to do their jobs.
Rosenblum had warned years earlier about the consequences of large-scale deportation policy. In written testimony to a Senate committee in 2015, before joining the first Trump administration, he argued that tougher immigration enforcement could harm families and communities. He also cited estimates that deporting all 11 million unauthorized immigrants would reduce the U.S. workforce by 6.4 percent and cut real GDP by $1.6 trillion, or 5.7 percent.
Other DHS officials have left during Trump’s second term, including acting ICE director Todd Lyons and several acting chiefs at the Federal Emergency Management Agency, according to WIRED and Government Executive. Few have publicly criticized the administration on the way out. Former ICE lawyer Ryan Schwank did, telling Congress that training for new ICE recruits was “broken,” according to NBC News. Rosenblum has now added the department’s own statistics shop to that list.
This story draws on original reporting from WIRED.
