The UUP will join Sinn Fein, SDLP, Alliance and the Greens to argue for Northern Ireland staying within the European Union.
Here is a statement from the party;
The Ulster Unionist Party believes that on balance Northern Ireland is better remaining in the European Union, with the U.K. Government pressing for further reform and a return to the founding principle of free trade, not greater political union. The Party respects that individual members may vote for withdrawal on the 23rd of June.
David McCann holds a PhD in North-South relations from University of Ulster. You can follow him on twitter @dmcbfs