Mullin said DHS will comb through voter rolls in search of noncitizens.
It might cost more to apply to become a United States citizen if a rule proposed by the Trump administration is enacted.
A federal judge has blocked an attempt by the Trump administration to subpoena Minnesota Gov. Tim Walz and other state officials, calling it an effort to "harass and retaliate against them."
President Donald Trump signed a bill into law on Wednesday that gives his immigration and deportation agenda nearly $70 billion for the rest of his term.
DHS Secretary Markwayne Mullin said on Fox News the department is considering a plan to halt customs processing for international travelers at airports in sanctuary cities, a threat that could cripple SFO and the Bay Area economy.
The secretary of the Department of Homeland Security said Thursday that Immigration and Customs Enforcement officers will be "out there every day" during the FIFA World Cup 2026.