A key ally of Boris Johnson has refused to say who will take charge if Britain's nuclear weapons if there is a strike while the Prime Minister is in intensive care.
Michael Gove said giving details of the process would help Britain's enemies after he was quizzed about the grave possibility - however unlikely it might be.
It comes after Mr Johnson handed power temporarily to First Secretary of State Dominic Raab while he fights for life with Covid-19 in St Thomas' Hospital.
Mr Raab will lead the government's coronavirus response and chair today's 9.15am meeting - but decisions will be taken "collectively" by Cabinet.