The Prime Minister has warned it would be "foolish" for Britain to consider abandoning its Trident deterrent because the UK faces an increased threat of a nuclear attack from regimes including North Korea.
In an article for The Daily Telegraph, he has written:
We need our nuclear deterrent as much today as we did when a previous British Government embarked on it over six decades ago.
Of course, the world has changed dramatically.
The Soviet Union no longer exists. But the nuclear threat has not gone away.
In terms of uncertainty and potential risk it has, if anything, increased.
Last year North Korea unveiled a long-range ballistic missile which it claims can reach the whole of the United States.
If this became a reality it would also affect the whole of Europe, including the UK.
Can you be certain how that regime, or indeed any other nuclear armed regime, will develop?
Does anyone seriously argue that it would be wise for Britain, faced with this evolving threat today, to surrender our deterrent?
Mr Cameron adds that in his judgment, it would be "foolish to leave Britain defenceless against a continuing, and growing, nuclear threat."
More top news
Another disappointingly breezy and cool day for late July and a similar theme tomorrow.
The son of a coke plant foreman has won the right in principle to seek compensation for his father's death from respiratory problems.
A man from Northampton has admitted climbing on to the roof of Parliament and causing £5,500 of damage in an eight-hour police stand-off.