New York: The mounting problem Donald Trump poses to Republicans is also a mounting problem for Rupert Murdoch. The media mogul hasn’t been able to control his most powerful media organ: Fox News. Murdoch has tried — and failed — to rein in Fox News boss Roger Ailes. This week, Ailes is said to have told his senior execs that Murdoch recently called him and asked if Fox could “back off the Trump coverage.” Ailes reportedly boasted that he told Murdoch he was covering Trump “the way he wanted to.” The implication was that he wasn’t going to budge.