US President Donald Trump's administration is to make it more difficult for poorer legal migrants to extend their visas or gain permanent resident status.
The rule targets migrants who rely on public assistance, such as food aid or public housing, for more than a year.
Their applications will be rejected if the government decides they are likely to rely on public assistance in the future.
Officials said the rule change would reinforce ideals of self-sufficiency.
Immigrants who already hold a green card are unlikely to be affected.
The new regulation, known as a public charge rule, was published in the Federal Register Monday and will take effect on October 15.