Migrants who cross the southern US border illegally will temporarily be denied asylum under a new rule, US President Donald Trump has said.
Mr Trump has signed a proclamation barring migrants who enter illegally from asylum for up to 90 days.
The president can stop migration in the "national interest", a statement said. Rights groups say it is illegal and have launched a legal challenge.
The proclamation, which goes into effect on Saturday, triggers regulations adopted by immigration officials on Thursday.
"I just signed the proclamation on asylum - very important," the president told reporters on Friday before leaving for Paris.