We are at their mercy.
For example, if I'm not telling tales out of school here, I believe the Bloc has its summer caucus next week for two or three days. They had requested that next Thursday's meeting be postponed by a day, because if not, then their caucus meeting would be disrupted. However, the whips couldn't come to an agreement, because other committees had already had their times set. We are at the mercy of the whips.