"Mae datganiad Prif Weinidog yr Alban yr wythnos ddiwethaf yn ein hatgoffa bod gan bob un o lywodraethau'r Deyrnas Unedig safbwyntiau gwahanol ar ein Hundeb. Mae Llywodraeth Cymru yn credu yn yr Undeb, ond rydyn ni'n credu bod rhaid iddo newid. Roedd angen newid cyn Brexit; mae Llywodraeth Cymru wedi bod yn mynegi pryderon am gyfansoddiad y Deyrnas Unedig ers 2012 o leiaf. A nawr, mae'r penderfyniad i ymadael wedi amlygu'r angen am newid sylfaenol ymhellach, oherwydd mae wedi'n gorfodi i wynebu gwirioneddau nad oedd unrhyw un wedi meddwl amdanynt o'r blaen.
“The statement by the Scottish First Minister last week serves to remind us that each of the 4 governments of the UK have a distinct perspective on our Union. The Welsh Government believes in the Union, but we believe it has to change. The need for change predates Brexit; the Welsh Government having articulated concerns about the UK’s constitution since at least 2012. And now, the decision to leave has thrown the need for fundamental change into sharper focus, not least because it has forced us to confront realities no one had really thought about before.