Rupert Murdoch is not just dumping Donald Trump. He wants back his role as the world’s most feared media mogul.

At the age of 91, Murdoch has cast off what he felt were the shackles of a constraining marriage and is in the process of regaining total control of his global media empire, as well as reasserting his political influence in America.

This won’t be easy. He has to persuade the stockholders in the two halves of his empire, Fox Corp and News Corp, that they should be merged into one, with him at the top—nearly a decade after they were forced to split up when his British tabloids, part of News Corp, were exposed to the huge legal costs of a phone-hacking scandal.

His decision to merge the companies has angered stockholders in both—for different reasons. Many investors in News Corp, which houses Murdoch’s legacy newspaper businesses, don’t want to be associated with Fox News—as one told the Financial Times, “Fox News is kind of toxic and should be ringfenced.” On the other side, Fox investors fear that their company, which gushes profits, would lose value by being in the same stable as the newspapers, in a struggling sector with far larger costs and that generates far less money.