Scottish Labour's position on the renewal of Trident is 'a complete farce', Ruth Davidson has said.

The Tory leader made the remarks while promoting her party as the only one willing to defend "Britain's security" and jobs dependent on Trident nuclear weapons.

Davidson said: "Scottish Labour's position on Trident is a complete farce."

"It wants to cancel Britain's nuclear deterrent, it claims it will maintain the jobs sustained by Trident, but it can't even say how many jobs are involved."

She added: "There was once a time when Labour stood up proudly for a strong defence and for workers' jobs.

"Now it is lining up alongside the SNP with a unworkable proposal which would only wreck our nation's defences."

"Our message to people whose jobs are reliant upon Trident is clear: we are the only party which will stand up for you and defend your jobs and Britain's security."

The attack comes after Labour leader Kezia Dugdale, appearing on STV's Face to Face with Bernard Ponsonby on Wednesday night, was unable to remember the number of jobs presently dependent on Trident.

Unveiled on Wednesday, Scottish Labour's manifesto said the party opposed Trident renewal on the condition that "all existing jobs" dependent on Britain's nuclear deterrent were retained.

In the STV interview, Dugdale said she couldn't remember exactly how many jobs it was, but that the number was detailed in the Unite motion passed at the Scottish Labour conference in November 2015, which set out the party's opposition to Trident.

The Conservatives said the Unite motion did not contain any figures at all.

The Unite motion can be read here.

The Ministry of Defence said in November 2015 that the renewal of Trident secured 6800 jobs at Faslane naval base alone, and also claimed in January 2016 it supported over 30,000 jobs throughout the UK.

Scottish Labour said their decision to oppose Trident renewal came about through a democratic choice.

A party spokesperson said: "Scottish Labour took a decision to open up our policy making process to our membership.

"As a result of the decision taken at our conference, Scottish Labour's policy is to oppose the renewal of Trident, subject to firm commitments guaranteeing the retention of defence jobs and the establishment of a Defence Diversification Agency to protect employment directly connected to the sector."

The SNP said the Tories were "hell-bent" on Trident renewal.

A party spokesperson said: "With the Tories hell bent on the renewal of Trident and Labour all over the place on the issue, only the SNP will always oppose obscene, costly and dangerous nuclear weapons.

"By casting both of their votes for the SNP people can re-elect Nicola Sturgeon as First Minister with a strong SNP Government that will invest in our NHS, improve attainment in our schools and never, ever support the renewal of Trident."

Labour lack a "coherent" position on the "morally unacceptable" nuclear weapons system, said the Scottish Greens.

The party's Europe spokesperson Ross Greer said: "Yet again Labour are totally unable to come to anything like a coherent position on Trident.

"These weapons of indiscriminate slaughter are not just morally unacceptable, they are financially unjustifiable.

"With the hundred billion pounds earmarked for their renewal we can not only secure the jobs currently tied to Trident, we can build a vibrant new economy on the Clyde, create high-quality, long-lasting jobs in the real economy and still have tens of billions to spare."

Greer added: "Scottish Greens are proud to have brought about Holyrood's first vote against the nuclear weapons system, and we are equally proud of our opposition to the NATO nuclear club.

"With more Green MSPs we can ensure broad opposition to Trident, and advance a bold plan for diversification of our economy and investment in the jobs of the future."

The Scottish Liberal Democrats have also been approached for comment.