It would create common rules on migration in the EU, and make it easier for member states to limit numbers entering the bloc.
MEP'S will vote today on new laws to tighten migration in the EU.
The New Pact on Migration and Asylum was agreed by member states in December, and Justice Minister Helen McEntee secured Oireachtas approval for Ireland to opt-in last month.
It would create common rules on migration in the EU, and make it easier for member states to limit numbers entering the bloc.
It would also give the option of making financial contributions or providing support to other member states instead of accepting migrants into their own country