Over the past 18 months, Rupert Murdoch or his media empire have been threatened or under legal attack by two voting machine companies, US president Donald Trump, and even three of his own children.

The 94-year-old, who has recently married for the fifth time, is as much a serial litigant as he is a serial groom.

Fox News dominates the conservative media.

News overnight that his Fox channel’s competitor, Newsmax, has slapped Fox with a lawsuit claiming that it used dirty tactics and its powerful muscle to limit the smaller rival from getting access to distribution over cable and streaming services, has opened up another line of attack on the media’s largest empire.

In a David and Goliath battle, Murdoch will probably be happy to assume the role of giant.

But the legal filing that details claims of a litany of skulduggery to undermine its competitors is truly eyebrow-raising, even for seasoned Murdoch critics.

The nub of Newsmax’s legal complaint is that Fox engaged in what it called an “exclusionary scheme” to limit cable or digital distributors from putting the........

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