A vote in favour of renewing the Trident submarines could be the catalyst for a second Scottish independence referendum.
That’s according to the SNP’s defence spokesman, MP Brendan O’Hara.
The House of Commons is set to vote on whether to replace the four nuclear submarines, and thus renew the nuclear deterrent, on Monday.
The media pack were out in force at Westminster today – as the cabinet entered Downing Street for their last meeting with David Cameron as Prime Minister, before Theresa May takes up residence tomorrow.
One of her first challenges will be Trident.
The Scottish National Party has been long been opposed to Trident – particularly as it's based at Faslane in Argyle and Bute.
They're long-standing opponents of anything nuclear – having argued that the money trident will cost could be better spent elsewhere.
£3 billion has already been spent on what’s know as the “initial gate” phase.
The government have previously put the full bill at between £15 and £20 billion, although it admitted this figure could rise to £40bn during the 2015 Strategic Defence and Security Review.
Labour leader Jeremy Corbyn, and the independent Trident Commission, claim it'll be more like £100 billion, while an estimated figure of £167 billion was verified by Reuters.
Labour have supported the nuclear deterrent for 50 years – but Corbyn is a vehement opponent. The party's MPs will be given a free vote on the issue, however.
Shadow Secretary of State for Defence Clive Lewis, however, has said Labour MP's will be given a free vote on Trident.
The vote on Trident will be the first major test for the premiership of Theresa May.
MP’s are likely to vote it through - but that could lead to consequences.