"They are contrary to our clear intention to ensure that any future proposal to amend the European Union treaties to transfer further competence or power from this country to the European Union should be subject to the consent of the British people, " he said.

BBC: European Union Bill: Consideration of amendments

He said "it might be that a more generous transfer of legislative competence to the assembly" is needed.

BBC: Welsh assembly's 'new power after Scots independence'

The Legislative Competence Order (LCO), which would transfer the powers, was approved by Whitehall departments, a committee of AMs and publicly endorsed by assembly government Deputy ousing minister Jocelyn Davies.

BBC: Legal row over housing laws veto