Theresa May should delay Monday's vote on renewing Trident to allow time for a "fully informed debate", the SNP says.

The party's Westminster leader Angus Robertson said the decision was too important to be taken after "a month of backstabbing, score-settling and navel-gazing" among Tory and Labour MPs.

Mr Robertson added that the true cost of renewing the nuclear weapons programme must be made available to MPs before they can come to an informed decision.

He pointed to CND figures indicating the price would be at least £205bn - far higher than the UK Government's estimate of £167bn - and reaffirmed his party's opposition to the weapons.

Mr Robertson said: "Trident is an immoral, obscene and redundant weapons system - and the decision on whether to renew it is one of the most important votes this parliament will ever take.

"Over the last few weeks we have witnessed unprecedented political turmoil, as the entire Westminster system was shown to be completely unprepared for the prospect of a Brexit vote.

"Having spent the best part of a month engaged in backstabbing, score-settling and navel-gazing, neither the Tories nor Labour are in any fit state to be giving proper scrutiny to decisions as important as this.

"In recent months the Tories seem to have viewed Trident as a political tool with which to try and embarrass divisions in the Labour party - that is a frankly disgraceful way to behave towards such a crucial decision.

"Theresa May has make big commitments about a new style of government. I would urge her to put her words into action by showing that the Tories' political games around Trident are a thing of the past - and allow MPs, and the public, the fully informed debate that they deserve."

His comments came as the Labour Party's deputy leader Tom Watson said abandoning the deterrent would remove the "the protective curtain behind which freedom and democracy have flourished in countries across eastern Europe".

"To abandon our deterrent in that context would be a grotesque abandonment of our friends at a time of great peril," he said.

He added that those who vote against the renewal are in favour of putting "livelihoods of thousands of skilled British workers" at risk and inflicting "real harm" on the UK's defences.