“Please be prepared to present your staff ID card to security when entering the building,” Mr Gray said.

“If you do not have your pass with you, access to the building may be delayed while you are verified.”

The bushfire crisis ravaging Australia has focused attention on the climate coverage in News Corp mastheads such as The Australian, The Daily Telegraph and the Herald Sun.

“Kathryn and James’ views on climate are well established and their frustration with some of the News Corp and Fox coverage of the topic is also well known,” a spokesperson for Murdoch and his wife told The Daily Beast website.

"They are particularly disappointed with the ongoing denial among the news outlets in Australia given obvious evidence to the contrary.”