Chair, making a point of order on that, I would read from the rules of procedure:
Disorder and misconduct in a committee may arise as a result of the failure to abide by the rules and practices of a committee or to respect the authority of the Chair.
In the event of disorder, the Chair may suspend the meeting until order can be restored....
I would remind the committee that you have that authority. If your ruling is being disrespected by one of the members of the committee, it is disorder. There are precedents for that.