Senior figures at Guardian News & Media are seriously discussing the move to an entirely online operation, it has been claimed, leaving Mr Rusbridger increasingly isolated.

The longstanding Guardian chief wants to develop the Guardian’s digital-only US operation before pulling the plug on the print edition, in the hope that it will provide a useful blueprint for the online business in Britain.

However, trustees of the Scott Trust, GNM’s ultimate owner, fear it does not have enough cash on its books to sustain the newspapers for that long, according to More About Advertising, the website run by former Marketing Week editor Stephen Foster.

The Guardian publisher has spent the last few years battling to stem losses of £44m a year. However, it has been slow to make savings and any money that it has clawed back has been spent on expanding its US and online operations.