President Donald Trump has issued an executive order for an “impassable physical barrier” to be built along the US border with Mexico.

He also signed an action to strip funds from US cities that are sanctuaries for undocumented immigrants, according to the BBC.

White House spokesman Sean Spicer had earlier explained that cities like San Francisco do not collaborate with US federal authorities in the fight against illegal immigration. In case of further refusal to collaborate, Trump plans to cut their funding.