Former Texas Democratic Rep. Beto O'Rourke said Thursday that he would "absolutely" support tearing down existing barriers along the southern border with Mexico, in a full-throated embrace of open-borders rhetoric that has left conservatives wondering where other potential 2020 Democratic White House hopefuls stand on the issue. O'Rourke's comments came as the House and Senate passed a compromise spending bill that would partially fund President Trump's proposed border wall, to the tune of $1.4 billion. Trump, who had been pressing for billions more, has vowed to declare a national state of emergency to fund the remainder of the project. Amid...