The US is to send an additional 2,000 troops to its border with Mexico, the Pentagon has announced
It will bring the total number of troops stationed on the southern border to about 4,300.
The Pentagon said the soldiers would help border-patrol agents, carry out surveillance work and install miles of razor wire.
It comes as President Donald Trump battles Congress for funds to build a wall along the border.
He says such a measure is needed to stop illegal immigration.
Mr Trump's insistence that the lower house of Congress, now controlled by his Democratic opponents, include funds for the wall in the US budget recently led to the longest government shutdown in US history.