President Trump has resorted to extreme measures – and risked a major constitutional crisis – to get a wall built along the border with Mexico.
Speaking at the White House he declared a national emergency, a move that will free up billions of dollars of emergency funds, but will almost certainly face a legal challenge.
It has already been described as a violation of the US constitution.
The president claims a wall was the only way to stop the US being invaded by illegal immigrants, criminals and drugs.
Sky’s US correspondent Amanda Walker reports.
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