Iraq plans to hold a referendum on a controversial military pact allowing US troops to remain for another three years that parliament is expected to adopt on Thursday in a delayed vote. The decision to hold such a referendum could set Baghdad on a collision course with Washington, which needs the military pact to replace its troops' UN mandate to operate in Iraq, which expires on December 31. "It is not only the Iraqi parliament that has a role in overseeing this agreement, but the Iraqi people, who will have a referendum on July 30 so they can see if the agreement is correct or not, six months after it comes into effect," Iraq's top negotiator Muwafaq al-Rubaie told Dubai-based Al-Arabiya television.