Quick Guide: European Union constitution
Printable version
Europe's rule book


Foreign and defence policy

More key features

Political arguments


No EU treaty has yet been sunk by voters, but it could happen

The 25 EU member states must ratify the constitution by the end of October 2006 - two years after they signed it.

If any country rejects it in a referendum, the way forward is unclear.

The country could hold a second vote, possibly after negotiating opt-outs. It could leave the EU. Or the constitution could be altered or abandoned.

Referendums have given the EU problems in the past. Irish and Danish voters have both said No to key EU treaties, then said Yes in a re-vote.