I will read from the big green book, as it's referred to:
...the Chair may, at his or her discretion, interrupt a member whose observations and questions are repetitive or are unrelated to the matter before the committee. If the member in question persists in making repetitive or off-topic comments, the Chair can give the floor to another member.
It's something that's at my discretion. We always allow things to stray, but we should be on the amendment. There are a lot of things with a lot wider scope on the motion itself, and it seems that people are determined to debate the motion and not the amendment to the motion.
I'm very happy if we wish to vote on the amendment and we can move to the motion that everyone seems so preoccupied with. Until then, we are on the amendment.