On page 151 of O'Brien and Bosc, the last two sentences say that
Should a member disagree with the Chair's decision
—this is what the role is of the chair, but obviously I disagree with the decision—
the Member can appeal the decision to the committee ( i.e., move a motion “Shall the decision of the chair be sustained?”). The committee may sustain or overturn the Chair's decision.
I move that motion at this time, Mr. Chair.