Trump declares border emergency and seeks to end US birthright citizenship

From behind his desk in the Oval Office, President Donald Trump signed a flurry of executive orders and decrees aimed at cracking down on immigration.

From one order tackling the definition of birthright citizenship, to another declaring illegal immigration at the border a national emergency, Trump swiftly made moves on his promises to tighten the US-Mexico border.

But some of his plans - particularly around changing the definition of birthright citizenship - are likely to face significant hurdles.

He is already facing legal challenges from immigration advocacy groups, which have reacted furiously to his announcements.