Helen McEntee (Meath East, Fine Gael) | Oireachtas source

My firm view is that the question of ceding sovereignty to the EU by opting in to the measures does not arise. To quote somebody who campaigned for the Lisbon treaty at the time:

The Lisbon Treaty neither creates a new state nor dissolves any existing state. It creates no new or competing source of sovereignty and it extinguishes no existing source of Member State sovereignty.

I agree with that.