Homeland Security report claims Trump wall would cost $21bn to build and take more than three years

A report by the US Department of Homeland Security claims that President Donald Trump’s wall along the border with Mexico would cost up to $21.6bn and take more than three years to build.

Mr Trump had cited a figure of around $12bn during his campaign for the wall, which Homeland Security said would be made up of fences and walls covering more than 2,000 km by the end of 2020.