▁all ▁the ▁provinces ▁and ▁the ▁federal ▁parliament . ▁If ▁changes ▁to ▁the ▁line ▁of ▁succession ▁to ▁the ▁Canadian ▁throne ▁were ▁found ▁to ▁fall ▁under ▁this ▁provision , ▁it ▁is ▁possible ▁that ▁any ▁single ▁provincial ▁legisl ature — such ▁as ▁Quebec ' s — could ▁h inder ▁any ▁attempts ▁at ▁change . ▁In ▁the ▁a for ement ioned ▁court ▁decision , ▁Justice ▁J . ▁Rou le au ▁determined ▁that ▁" un il ater al ▁changes ▁by ▁Canada ▁to ▁the ▁rules ▁of ▁succession " ▁would ▁be ▁" a ▁fundamental ▁change ▁in ▁the ▁office ▁of ▁the ▁Queen " ▁requiring ▁author izations ▁purs u ant ▁to ▁section ▁ 4 1 ▁of ▁the ▁Constitution ▁Act , ▁ 1 9 8 2 . ▁The ▁preced ent ▁in ▁question ▁does ▁not ▁specify ▁whether ▁non - un il ater al ▁alter ations ▁to ▁the ▁rules ▁of ▁succession ▁would ▁also ▁be ▁considered ▁a ▁fundamental ▁change ▁in ▁the ▁office ▁of ▁Queen , ▁requiring ▁a ▁constitution al ▁am end ment ▁under ▁the ▁un anim ous ▁consent ▁procedure . ▁The ▁judge ▁stated ▁that ▁" a ▁constitution al ▁mon archy , ▁where ▁the ▁monarch ▁is ▁shared ▁with ▁the ▁United ▁Kingdom ▁and ▁other ▁Commonwealth ▁countries , ▁is , ▁in ▁[ his ] ▁view , ▁at ▁the ▁root ▁of ▁[ Can ada ' s ] ▁constitution al ▁structure ". ▁ ▁Provin cial ▁input ▁As ▁a ▁matter ▁of ▁common ▁practice ▁for ▁Senate ▁comm itte es ▁review ing ▁legisl ation ▁in ▁which ▁a ▁province ▁or ▁territory ▁may ▁have ▁interest , ▁the ▁cl erk ▁of ▁the ▁Leg al ▁and ▁Constitution al