Yn olaf, roeddwn yn glir na all Llywodraeth Cymru argymell bod y Cynulliad Cenedlaethol yn rhoi cydsyniad deddfwriaethol i Fil yr EU (Ymadael) oni chaiff materion ynghylch pwerau datganoledig Llywodraeth Cymru a Chynulliad Cenedlaethol Cymru eu datrys mewn diwygiadau y dylid cytuno arnynt cyn i'r Bil ymadael â Thŷ'r Cyffredin.  Cytunodd Llywodraeth y DU y dylid cael trafodaeth benodol bellach ar lefel swyddogol ynghylch atebion posibl.
Finally, I was clear that the Welsh Government cannot recommend that the National Assembly gives legislative consent to the EU (Withdrawal) Bill  unless  issues surrounding the devolved powers of the Welsh Government and National Assembly for Wales are resolved in  amendments which should be agreed before the Bill leaves the House of Commons.  The UK Government agreed there should be further specific discussion at official level around potential solutions.