Trump is not first president to deploy troops to US-Mexico border

Donald Trump said on Tuesday he wants to use the military to secure the border until his promised border wall is built.Despite his claim on Tuesday that he is taking an almost unprecedented step, Donald Trump is not the first commander in chief to deploy troops to the US-Mexico border.Barack Obama sent 1,200 members of the National Guard to the frontier in 2010, following on from George W Bush’s decision four years earlier to boost the military presence there.