President Donald Trump says he will suspend all immigration into the US temporarily through an executive order in response to the coronavirus outbreak and to protect jobs.
The move, which the Republican president announced on Twitter, effectively achieves one of Mr Trump's long-term policy goals of curbing immigration, making use of the health and economic crisis that has swept the country as a result of the pandemic to do so.
The decision drew swift condemnation from Democrats.
Mr Trump said he was taking the action to protect the US workforce. Millions of Americans are suffering unemployment after companies shed employees amid nationwide lockdowns to stop the contagion.
"In light of the attack from the Invisible Enemy, as well as the need to protect the jobs of our GREAT American Citizens, I will be signing an Executive Order to temporarily suspend immigration into the United States," Mr Trump said in a tweet.
The White House declined to offer further details about the reasoning behind the decision, its timing, or its legal basis.
Mr Trump won the White House in 2016 in part on a promise to curb immigration by building a wall on the US border with Mexico. He and his advisers have spent the first three years of his tenure cracking down on both legal and illegal entries into the country.
"You cut off immigration, you crater our nation's already weakened economy," former Democratic presidential candidate Julian Castro said in a tweet. "What a dumb move."
The development comes as the US death toll from the virus topped 42,000 on Monday, according to a Reuters tally.
The US economy has come to a near standstill because of the pandemic; more than 22 million people applied for unemployment benefits in the last month.
The US has the world's largest number of confirmed coronavirus cases, with more than 780,000 infections, up 27,000 on Monday.
The US in mid-March suspended all routine visa services, both immigrant and non-immigrant, in most countries worldwide due to the coronavirus outbreak in a move that has potentially impacted hundreds of thousands of people.
The administration recently announced an easing of rules to allow in more agricultural workers on temporary H2A visas to help farmers with their crops.
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If you believe you may have contracted the virus, call your doctor (don’t visit) or contact the national Coronavirus Health Information Hotline on 1800 020 080. If you are struggling to breathe or experiencing a medical emergency, call 000.
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