After years of watching their incomes go nowhere, America's middle class finally got a big raise last year. Median household income rose to $56,516 in 2015, up from 5.2% a year earlier, according to data released by the U.S. Census Bureau Tuesday.

US Republican presidential candidate Donald Trump has insisted Mexico will pay for a border wall "100%", in a major immigration speech. He told a rally in Arizona that he would secure the US borders and millions of undocumented immigrants could be subject to deportation.