Democrats and Republicans are hardening their positions on President Trump's proposed border wall, raising the odds of a partial government shutdown this month. The White House and Senate Democrats are already pointing fingers over who would be to blame if a shutdown occurs, with each accusing the other side of precipitating a potential funding lapse over the wall. "If President Trump wants to throw a temper tantrum and shut down some departments and agencies over Christmas, that's certainly within his power," Senate Minority Leader Charles Schumer (D-N.Y.) said Thursday on the Senate floor. The White House shot back, accusing Democrats...