Timmy Dooley (Clare, Fianna Fail) | Oireachtas source

Through the Chair and on a point of order, to save the Deputy, I will just protect my corner first and then let him protect his. My understanding is that a priority question cannot be grouped. We are entitled to our time. If the Deputy has a similar question he is entitled to pursue it with the Minister. I have been around the House a while and I may be wrong on this, which is why I seek the clarification, but my understanding is that, when it comes to oral questions, a priority question is just that: it is a one-to-one between the Deputy and the Minister. The same applies to the next Deputy. Groupings, as I have always understood it-----

See this speech in context