Donald Trump is going to have to get through the final weeks of his campaign without Jim Murphy, his national political director, who has decided to take a "step back" for undisclosed reasons. "I have not resigned but for personal reasons have had to take a step back from the campaign," Murphy, a longtime GOP political operative, tells Politico. Trump aides say Murphy has been absent from the campaign over the last few days. The Hill reports that Murphy, who joined the campaign in June and set up field operations in battleground states, was a close ally of former Trump campaign chief Paul Manafort. (Trump was booed at a NYC charity dinner Thursday night.)