A vote to renew Trident against the wishes of nearly every MP in Scotland has sparked further calls for a vote on independence.
In a vote in the House of Commons, 58 of Scotland's 59 MPs voted against Trident renewal - with Scotland's only Tory MP, David Mundell, being the sole supporter.
SNP Westminster leader Angus Robertson said the vote exacerbates the "democratic deficit" in Scotland weeks after Scottish voters overwhelmingly voted in favour of the EU but were outvoted by England and Wales.
Only a few short weeks ago Scotland voted to remain within the European Union. If Scotland is a nation, and Scotland is a nation, it is not a normal situation for the state to totally disregard the wishes of the people, and this government has a democratic deficit in Scotland, and with today's vote on Trident it's going to get worse, not better. It will be for the Scottish people to determine whether we are properly protected in Europe and better represented by a Government that we actually elect - at this rate, that day is fast approaching.
Conservative MPs said the SNP has disregarded the 13,000 Scottish jobs unions say are dependent on the Trident fleet at HMNB Clyde.
The SNP ignores at least half of Scottish public opinion and is a party that is content to dispense with our deterrent, but happy to cower under an American nuclear Nato umbrella.
Meanwhile, four protesters chained themselves to the gates of Holyrood Palace, the Queen's residence in Edinburgh outside the Scottish Parliament.
Malcolm Bruce and David Mackenzie unfurled a banner which read "HMS Trident 2? We say naw!" and chanted "Ban the bomb".
Wheelchair user Mike Blackshaw chained himself to the public entrance gate, and linked arms with Janet Fenton of the Edinburgh Peace and Justice Resource Centre.