News Corp had been exploring opportunities in the TV market for content from News UK, its British newspaper publisher, over the past 18 months News UK Chief Executive Rebekah Brooks said in the memo.

It had hired David Rhodes, a former president of ViacomCBS (VIAC.O) owned CBS News, to consult on the process.

"We determined early on in that review that it was not commercially viable to launch a traditional news channel on linear TV," Brooks said.

"Whilst there is consumer demand for alternative news provision, the costs of running a rolling news channel are considerable, and it is our assessment that the payback for our shareholders wouldn't be sufficient," she added.

"We need to launch the right products for the digital age," Brooks said in the memo, which was first reported by The Spectator on Tuesday.

Rhodes will leave the company in June.