President Trump’s disapproval rating has hit a high point of 60 percent, according to a new Washington Post-ABC News poll that also finds that clear majorities of Americans support the special counsel’s Russia investigation and say the president should not fire Attorney General Jeff Sessions. At the dawn of the fall campaign sprint to the midterm elections, which will determine whether Democrats retake control of Congress, the poll finds a majority of the public has turned against Trump and is on guard against his efforts to influence the Justice Department and special counsel Robert S. Mueller III’s wide-ranging probe. Nearly...