Constitution minister Michael Russell said this was "untenable" after Tory leader David Cameron said he would not stand in the way of a referendum on greater powers for the Welsh Assembly.
The Scottish Government branded the Tories "utter hypocrites" over their opposition to an independence referendum.
Constitution minister Michael Russell said this was "untenable" after Tory leader David Cameron said he would not stand in the way of a referendum on greater powers for the Welsh Assembly.