Donald Trump has said his new US immigration ban would last for 60 days and apply to those seeking "green cards" for permanent residency.
The US President described the proposals as an effort to protect Americans trying to regain jobs lost because of the coronavirus pandemic.
Mr Trump plans to institute the ban through an executive order, which he said he was likely to sign on Wednesday.
He said it would not apply to individuals entering the US on a temporary basis and would be re-evaluated once the 60-day period had passed.
"It would be wrong and unjust for Americans laid off by the virus to be replaced with new immigrant labour flown in from abroad. We must first take care of the American worker," Trump said.
The president said there would be some exemptions in the order and he could renew it for another 60 days or even longer.
He won the White House in 2016 in part on a promise to crack down on immigration.
Critics saw his announcement as a move to take advantage of a crisis to implement a long-sought policy goal.
The order could spark legal action.
A senior administration official said the administration was looking at a separate action to cover others affected by US immigration policy, including those on so-called H-1B visas.
The order would include exemptions for people involved in responding to the coronavirus outbreak, including farm workers and those helping to secure U.S. food supplies, he said.
The official said as the country begins to open up its economy, immigration flows were expected to increase, and the administration wanted to ensure that employers hire back fired workers rather than giving jobs to immigrants at lower wages.
Mr Trump confirmed that a secondary order was under consideration for a separate time.
The US Department of State issued roughly 462,000 immigrant visas in fiscal year 2019, which began on Oct. 1, 2018. The visas allow an immigrant to obtain lawful permanent resident status, informally known as a green card. The status allows a person to live and work in the United States and apply for citizenship after a five-year period.
Critics viewed Mr Trump's new policy as an effort to distract from his response to the pandemic.
"I think this is a malevolent distraction," said Neera Tanden, president of the Centre for American Progress, a left-leaning policy institute in Washington.
Giovanni Peri, an economics professor at the University of California, Davis, said researchers generally agree that immigration into the United States has stimulated economic growth, increased the size of the economy and created jobs.
“The idea that immigration threatens American jobs is just not there in any data,” he said.