House Intelligence Chairman Adam B. Schiff said Wednesday that he believes President Trump attempted to threaten him by suggesting he be subjected to Guatemala’s justice system. Mr. Schiff, California Democrat, was responding to a remark Mr. Trump made about him the previous day during a press conference held in the Oval Office alongside Guatemalan President Jimmy Morales. Complaining about the congressman’s interpretation of his now-infamous July 25 phone call with the Ukrainian president, Mr. Trump said Tuesday: “In Guatemala, they handle things much tougher than that.”