Trump signs a national emergency order for the border, setting up an expected legal battle with Democrats. Trump speaks about security at the US-Mexico border in the Rose Garden of the White House [Carlos Barria/Reuters] US President Donald Trump declared a national emergency at the United Sates-Mexico border on Friday, a move expected to plunge him into a fight with Democrats over what they call an unconstitutional attempt to fund a wall without approval from Congress. Trump had demanded Congress include money for the wall, one of his biggest 2016 campaign promises, in a funding bill he signed later on Friday. It was approved overwhelmingly by Congress late on Thursday without the wall money he wanted, a legislative defeat for him. A national emergency, if not blocked by the courts or Congress, would allow Trump to dip into funds politicians had approved for other purposes to build a border wall. The spending measure, lacking any money for his wall, i...