Rupert Murdoch has lost a legal fight to change his family's trust, which would have let his son Lachlan take control the family's media empire after Murdoch's death.

A sealed document obtained by The New York Times says a Nevada commissioner has ruled against Rupert Murdoch’s effort to change his family’s trust to give his son Lachlan Murdoch control of his media empire and ensure Fox News maintains its conservative editorial slant.

Rupert Murdoch has lost a bid to change his family trust to consolidate control of his media empire in the hands of his son Lachlan, the New York Times reported on Monday, citing a sealed court document.