Since the motion proposed by Mr. Cullen falls under the rubric of committee business, which is what we're on right now while we're dealing with Mr. McGuinty's motion, it doesn't require the usual 24 hours' notice that the committee requires for most motions.
Committee business tends to be a very broad category. Since most things can fall within the category of committee business, it would be acceptable in terms of past practice for Mr. Cullen to bring forward his motion, following the committee's dealing with Mr. McGuinty's motion.