Rupert Murdoch is involved in a legal battle with his children over his plans to hand over his global media empire to son Lachlan, according to a report. 

The fight for power between the 93-year-old mogul's four eldest children appeared to be decided when Lachlan emerged as the designated heir.  

But Murdoch is now fighting to extend his eldest son's voting power in the Murdoch Family Trust, the New York Times reported. 

The mogul, 93, is in a legal battle against three of his children to ensure that his eldest son and chosen successor, Lachlan Murdoch, 52, will remain in charge of his empire and keep his media outlets conservative. 

Murdoch reportedly wants to ensure that Lachlan cannot be challenged by his more politically-moderate siblings when it comes to the editorial agenda of their outlets including Fox News.

In court, Murdoch is arguing that having Lachlan run the company without interference from James, 51, Elisabeth, 55, and Prudence Murdoch, 66, will help preserve its conservative editorial stance.