New York City Mayor Zohran Mamdani and Attorney General Letitia James have filed lawsuits to stop the Trump administration from expanding a federal rule that weighs public benefit use against immigrants seeking green cards, a move the plaintiffs call fearful overreach but that enforces a principle as old as immigration law itself.
Mamdani, the city's first self-described socialist mayor, stood at a press conference Monday and announced the legal challenge alongside James, whose office is leading a separate coalition of 21 states and the District of Columbia. Both suits target the administration's plan to broaden the "public charge" rule, the longstanding federal standard that allows immigration officials to deny visas or green cards to applicants likely to depend on government assistance. The expanded version would add new public benefits to the list weighed in that determination, and it is set to take effect September 18, Fox News Digital reported.
The public charge doctrine is not new. Federal immigration law has long required applicants to show they can support themselves. What the Trump administration is doing is widening the net, expanding which benefits count against an applicant. Mamdani and James want a federal court to stop that expansion before it takes hold.
James filed her coalition's challenge in the U.S. District Court for the Southern District of New York, asking the court to block the rule outright. Mamdani's separate suit draws in the cities of Chicago, San Francisco, and Seattle, along with Santa Clara County in California and King County in Washington state. The White House did not immediately respond to a request for comment.
At the Monday press conference, Mamdani framed the rule as deliberately unclear, designed, in his telling, to frighten immigrants into abandoning benefits they legally qualify for. He claimed up to four million people could unenroll from healthcare under the expanded rule, though he did not provide a source or methodology for that figure.
Mamdani told reporters:
"The new public charge rule not only sweeps aside more than a century of established law, it is intentionally vague as a means of creating uncertainty and fear to isolate immigrant New Yorkers."
He added that citizens and individuals seeking humanitarian relief like asylum would not be affected by the changes. But he cast the broader rule as an effort to cut off services New Yorkers rely on.
Mamdani won election in November 2025 and took office January 1, 2026. He has governed New York City as an open socialist, and this lawsuit fits a pattern of progressive municipal leaders using the courts to resist federal immigration enforcement. That a mayor who embraces socialism is now suing to preserve welfare access for immigrants seeking permanent residency tells you where his priorities sit, and they are not with the taxpayers funding those programs.
Letitia James positioned her challenge as a sequel. She claimed her office previously fought "this exact policy" and won, though she provided no case name, court, or date for that prior victory.
James said in a statement:
"This rule preys on that fear and counts on families forfeiting the food assistance, health care coverage, and other public benefits to which they are legally entitled. My office fought this exact policy once before and won, and we are leading the nation to ensure the Trump administration cannot inflict this harm on families again."
She also argued that "hardworking families should not be forced to go without the support they need because they fear asking for assistance will get them deported." The framing is deliberate: cast the rule as a deportation threat rather than what it actually is, a factor in whether someone qualifies for a green card. Nobody is being deported for using food stamps. The rule asks whether an applicant is likely to become a public charge. That is a screening question, not a removal order.
James's record as attorney general has drawn scrutiny well beyond immigration policy. A prosecutor has alleged that her office ordered staff to target Trump and then deleted evidence, a claim that raises serious questions about whether James's legal actions are driven by law or by politics.
The geographic lineup of plaintiffs reads like a map of progressive governance. James's coalition includes 21 states and the District of Columbia, though none of those states have been publicly identified beyond New York. Mamdani's suit adds Chicago, San Francisco, Seattle, and two deep-blue counties in California and Washington.
These are jurisdictions that have spent years expanding public benefit access, declaring themselves sanctuary cities, and resisting federal immigration enforcement at every turn. Now they want a federal judge to prevent the administration from asking whether a green card applicant is likely to depend on government aid, a question that goes to the heart of whether immigration policy serves the country or just the applicant.
The public charge concept exists for a reason. American immigration law was built on the principle that newcomers should be able to stand on their own feet. Expanding which benefits factor into that assessment is not radical. It is a policy choice about where to draw the line, and the Trump administration is drawing it in a place that asks more of applicants, not less.
Internal concerns about James's broader conduct have only grown in recent months. Whistleblower accusations of politically motivated investigations have fueled questions about whether her office prioritizes legal merit or partisan objectives.
The SNAP program alone, the federal food assistance program, serves more than 40 million Americans each month. The scale of public benefit spending is enormous, and the question of whether immigration applicants should be screened for likely dependence on those programs is not an act of cruelty. It is basic fiscal stewardship.
For all the rhetoric, the lawsuits leave significant gaps. Neither plaintiff has publicly identified which specific benefits the Trump administration plans to add to the public charge determination. The legal theories behind the challenges, whether they rest on constitutional grounds, statutory claims, or administrative procedure arguments, remain unclear from the available reporting.
Mamdani's claim that four million people could lose healthcare coverage is unmoored from any cited study or data source. It is a political number, offered at a political press conference, by a politician who ran as a socialist. Readers can weigh it accordingly.
James, meanwhile, faces a political environment that is less friendly than it once was. Republican challengers have hammered her over declining Medicaid fraud recoveries and questions about how she has used her office's resources. Trump himself has endorsed a former federal prosecutor to unseat her, a signal that the political fight over James's tenure is far from one-sided.
The September 18 effective date gives the courts a narrow window to act. If a judge grants an injunction, the rule stalls. If not, the expanded public charge standard takes effect, and immigration officials will begin applying it to pending applications.
What Mamdani and James are really asking for is a legal guarantee that the federal government cannot consider welfare dependence when deciding who gets to stay permanently. That is not compassion. That is a policy choice to separate immigration decisions from their fiscal consequences, and to make sure taxpayers never get a voice in the equation.
