President Donald Trump has demanded funding for his proposed border wall and other hard-line immigration polices in exchange for allowing 800,000 illegal immigrants who came to the United States as children to avoid deportation.

Mr Trump was immediately accused by Democrats of reneging on a deal last month to protect the so-called "Dreamers," many of whom no longer have any connection to the countries where they were born.

The president sent to Congress a list of his priorities that would need to feature in any legislation designed to allow the Dreamers to stay.

But Democrats said it went "far beyond what is reasonable" and threatened to derail any proposed law.