The Trump administration on Sunday doubled down on its threat to shut down the southern border with Mexico, a day after it cut aid to Central American countries which President Donald Trump accused of deliberately sending migrants to the United States.

Faced with a surge of asylum seekers from Central American countries who travel through Mexico, Trump said on Friday there was a "good likelihood" he would close the border this coming week if Mexico does not stop unauthorized immigrants from reaching the United States.

He also accused, without providing evidence, the nations of having "set up" migrant caravans and sending them north.