Trump threatens to use emergency power to build wall, end shutdown

Trump flew to the Texas border with Mexico to try to bolster his case for the border wall as a partial U.S. government shutdown tied to the issue stretched into its 20th day with no sign of new talks to resolve the impasse."We can declare a national emergency."This is just common sense."Such a step would likely prompt an immediate legal challenge over constitutional powers from congressional Democrats - a challenge Trump said he would win.