“Yn ystod ymgyrch y refferendwm, fe addawodd yr ymgyrch i adael dro ar ôl tro na fyddai Cymru ar ei cholled yn ariannol o adael yr Undeb Ewropeaidd. Mae sawl un o'r ymgyrchwyr yna bellach mewn swyddi amlwg yn Llywodraeth y Deyrnas Unedig. Mae dyletswydd bendant arnyn nhw i gyflawni eu haddewidion.
“In the EU referendum campaign, the leave campaign promised time after time that Wales would be no worse off financially if we left the EU. Many of those campaigners are now in prominent positions in the UK Government. They have an absolute duty to deliver on what they promised.