Theresa May was briefed on the Trident missile test which reportedly went wrong in June, it emerged this morning.
But May's spokeswoman refused to say how much the prime minister was told or even to confirm there was indeed a fault with the missile.
Defence Secretary Michael Fallon is cutting short a regional visit to return to the Commons to take questions on Trident.
Defence Secretary Michael Fallon will cut short a trip to answer questions in the House of Commons on Trident.
It comes as Downing Street confirmed on Monday that it had known about the missile test off the Florida coast last June.
Fallon will face questions in the Common later this afternoon.
The Defence Secretary Michael Fallon repeatedly refused to confirm details of the test when he was summoned to the Commons.
Theresa May was briefed on the Trident missile test which reportedly went wrong in June, it emerged this morning.
MPs are urging the Prime Minister to give honest answers in Parliament about what she knew of the failed test last June.