President Donald Trump made a Thanksgiving Day threat to close the U.S. border with Mexico for an undisclosed period of time if his administration determines that its southern ally has lost "control" on its side. Trump also said he has given.... active-duty troops .... the "OK" to use lethal force against migrants "if they have to." [snip] The president would not discount the possibility of a partial government shutdown early in December over lawmakers' refusal to allocate the billions of dollars he is demanding for a border wall, the central promise of his 2016 campaign. "Could there be a shutdown?...