The rule mandates people seeking US immigrant visas be covered by "approved health insurance".(File)

A US federal court has issued a temporary injunction against President Donald Trump's administration's rule that would deny permanent residency to immigrants deemed likely to depend on public welfare.

Judge George Daniels of the US District Court in the Southern District of New York wrote in a 14-page opinion on Friday that immigrants who would potentially be affected by the White House's "public charge" rule could suffer "irreparable harm" if the regulation went into effect October 15 as scheduled, reports Xinhua news agency.

"The balance of equities and the interests of justice favor issuance of a preliminary injunction," Justice Daniels wrote.

Under the so-called "Inadmissibility on Public Charge Grounds" rule put forward by the Department of Homeland Security (DHS) on August 14, the US will disqualify legal immigrants from obtaining permanent resident status, commonly known as green cards, if they use, or are considered dependent upon, public-assistance programmes such as food stamps, housing assistance and Medicaid.

The DHS rule "changes the definitions for public charge and public benefits, and changes the standard that DHS uses when determining whether an alien is likely to become a 'public charge' at any time in the future and is therefore inadmissible and ineligible for admission or adjustment of status".

Justice Daniels argued that the administration's rule "is repugnant to the 'American Dream' of the opportunity for prosperity and success through hard work and upward mobility," adding the measure is "unlawful, arbitrary, and capricious rule".

Several lawsuits challenging the rule are currently underway across the nation, and the nationwide injunction will delay the enforcement of the regulation while those legal efforts are in process.

The district court's ruling came a week after Mr Trump issued a proclamation saying that his administration will suspend entry of immigrants who lack healthcare or cannot prove they are able to pay for medical expenses.

The proclamation, published by the White House on October 4, requested that those seeking US immigrant visas be covered by "approved health insurance" within 30 days of entry into the country, or possess "the financial resources to pay for reasonably foreseeable medical costs".