Lachlan and Rupert Murdoch
Rupert Murdoch and his son Lachlan Murdoch (left) attend the 2018 tennis US Open on Arthur Ashe stadium in Flushing Meadows, Queens, New York City.
  • Lachlan Murdoch said a Fox News host's comments were "smug and obnoxious", according to court docs
  • Leland Vittert came under fire for challenging Trump's election fraud claims, the lawsuit said.
  • The court documents reveal how Fox News executives feared alienating Trump's fans. 

Lachlan Murdoch, the eldest son of Fox News' billionaire owner, Rupert Murdoch, ordered a network anchor to be reprimanded for challenging Donald Trump's bogus voting fraud claims, court documents show.