New York City has a brand new mayor with an old habit of fighting President Trump.
This time the fight is over who gets to cash in on American welfare programs while waiting on a green card.
And the lawsuit Mamdani just filed drags a coalition of blue-city officials straight into one of Trump’s signature immigration fights.
The Lawsuit Targeting Trump’s Public Charge Rule
New York City Mayor Zohran Mamdani and mayors around the country filed a joint lawsuit seeking to stop President Donald Trump from making it harder for lawful immigrants to receive green cards or visas. Mamdani, the self-described democratic socialist who took over City Hall this year, wasted no time picking a fight with the Trump administration over an enforcement rule Republicans have wanted for years.
A federal rule change sought by the Trump administration would give immigration agents more leeway to deny green cards or visas to lawful immigrants on the basis of being a “public charge,” someone who’s using social safety net programs, and would allow agents to factor in the use of Medicaid or food assistance into their decision making. The rule is not some new invention dreamed up by the Trump administration out of thin air.
The public charge provision has been part of federal immigration law since 1882 and allows officials to consider whether an immigrant is likely to become primarily dependent on the government for subsistence. Trump is not rewriting immigration law. He is enforcing a standard that predates the income tax.
Mamdani did not see it that way at his City Hall press conference. “None of this is abstract,” Mamdani said, adding “People could die as a result of these changes.”
The mayor cited estimates that up to 4 million people from across the country could drop health care coverage to avoid being labeled a public charge. That figure comes from advocacy estimates, not a government audit, and it is worth remembering that the entire point of the rule is to stop taxpayer-funded benefits from becoming a magnet for immigration that was never supposed to depend on the welfare state in the first place.
New York City is leading a coalition of cities and counties that includes Chicago, San Francisco, Santa Clara County in California, Seattle, and King County in Washington. The suit, filed in the Southern District of New York, argues that the Trump administration overstepped legal precedent that puts limits on what immigration officials can consider when denying a green card or visa application on a “public charge” basis.
Chicago Mayor Brandon Johnson jumped in with his own statement. “Chicago will not stand by while the federal government forces immigrant families to choose between putting food on the table, taking their children to the doctor, or protecting their ability to remain in this country,” Johnson said.
New York State Attorney General Letitia James is leading a separate coalition that filed a concurrent suit, this one reportedly joined by two dozen states and the District of Columbia. James has been down this road before. She sued the first Trump administration over the same public charge concept back in 2019, and she is running the same play again now that Trump is back in office.
James argued the policy changes could force immigrant families to make difficult decisions about whether to seek help, saying “That means immigrant New Yorkers may be forced to ask themselves impossible questions. Will getting health insurance hurt my chances of getting a green card? Will accepting food assistance when I fall on hard times be held against me?”
Officials from the other jurisdictions piled on with similarly dramatic language. King County Prosecuting Attorney Leesa Manion called it “a humanitarian disaster” and vowed “We will always welcome immigrants from all backgrounds and fight any attempts to institute a wealth test for citizenship.”
Santa Clara County’s top lawyer took it a step further. Santa Clara County Counsel Tony LoPresti said the rule “flies in the face of more than a hundred years of law and history and decades of federal guidance” and called it “a deliberate attack against families, designed to bully them into dropping health insurance and delaying medical care, forgoing food assistance, and avoiding other critical services.”
Seattle’s city attorney went for a folksier version of the same argument. Seattle City Attorney Erika Evans said “Seattle is a place where people seeking opportunity can earn prosperity through hard work” and “Needing a little help along the way should never be used against someone in an immigration context,” adding “I promised to stand up with urgency and courage for Seattle, and that’s exactly what this lawsuit does. Seattle joins New York City, King County and other jurisdictions to fight to uphold our values.”
What This Fight Really Reveals About Blue-City Priorities
None of these officials are debating illegal immigration here. Every person covered by this rule is already here on a legal visa or seeking a green card, which is exactly why this fight matters so much for the broader immigration debate.
Legal immigration at high volumes carries the same fiscal and cultural strain as illegal immigration, and this lawsuit is a perfect example of why. A coalition of Democrat-run cities is suing to preserve the ability of green card applicants to draw on Medicaid and food assistance without consequence to their immigration status. That is not compassion. That is an incentive structure, and incentive structures produce more of whatever you subsidize.
Mamdani built his entire political career inside the democratic socialist movement before winning City Hall, and it shows in how quickly he reached for a courtroom instead of a negotiating table. The pattern with Trump’s public charge rule is not new. Letitia James ran this exact playbook against the first Trump administration, filing suit within days of the original 2019 rule and eventually winning a preliminary injunction in court. She is simply dusting off the same legal strategy for round two.
The larger question this lawsuit raises is who American immigration policy is supposed to serve. A public charge test rooted in an 1882 law was never controversial in this country until it became politically inconvenient for cities that have built entire municipal identities around unlimited, subsidized immigration. Chicago, San Francisco, Seattle, and now New York under Mamdani have spent years positioning themselves as sanctuary strongholds, and this lawsuit is simply the latest front in that same fight, just dressed up in the language of humanitarian concern rather than open borders.
Watch what comes next. If this challenge succeeds in blocking the rule, expect the same coalition of mayors and attorneys general to turn around and argue for expanding, not restricting, the public benefits available to green card holders and visa applicants. Today it is fighting a public charge test. Tomorrow it will be amnesty, in-state tuition for illegal aliens, or driver’s licenses regardless of status. The pattern with these blue-city officials is never to stop at defending the status quo. It is always the next expansion after that.
Sources: Yahoo News, Scripps News, NYC Mayor’s Office
