Will EU 'referendum lock' debate spark Tory rebellion?
MPs are to debate government plans to ensure "significant" powers can only be transferred to the European Union in future after a UK referendum.
Ministers say the proposals, contained in the EU Bill, will help preserve national sovereignty.
But some Tory MPs argue that the government will get the ultimate say on which issues go to a referendum, making the plan less democratic.
This report by Jo Coburn features Conservative MP Bill Cash.