The US Supreme Court has given the go-ahead to Trump administration plans that severely limit the ability of migrants to claim asylum.
The Trump administration unveiled the new asylum policy in July but it was almost immediately blocked from taking effect by a lower court ruling by a judge in San Francisco.
There has been a legal tussle over his block since but the decision issued on Wednesday will temporarily delay his rulings and allow the policy to come into effect.
Curbing migration levels has been a key goal of Donald Trump’s presidency and forms a major part of his bid for re-election in 2020.
What will the changes mean?
The change will affect non-Mexican migrants trying to enter through the US southern border.
Many of those arriving are fleeing violence or poverty and travel north through Mexico until they reach the US border. Upon arrival, they must pass a “credible fear” interview to seek asylum in the US.
The rule change means they would fail had they not claimed asylum in another country they had first passed through.
The Mexican president, Andres Manuel Labrador, earlier on Wednesday posted an image of himself on the phone to President Trump.
They are yet to publicly comment on the Supreme Court’s latest ruling – which is the second in favour of Mr Trump’s migration plans so far this year.
In July the nation’s top court ruled Mr Trump can use $2.5bn (£2bn) of Pentagon funds for his long-promised southern border wall.