In the party's manifesto yesterday, Scottish Labour claimed it would oppose the renewal of Trident but claimed it could guarantee the "retention of all existing jobs" in the event of Faslane closing.
This position fell apart last night after Kezia Dugdale was unable to say how many jobs fell under the guarantee.
She said the number was laid out in the Unite motion from the party's conference in November which set out opposition to Trident. However that motion does not contain any figures at all either.
The Scottish Conservatives are today calling on Scottish Labour to set out how many jobs they would guarantee - and to explain how people would be employed if a new generation of submarines were not to get the go ahead.
Ruth 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."
"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."
"With Labour and the SNP joining forces on this, we will make a firm case to keep Britain's defences strong and to keep jobs at Faslane."