presiding officer

He also said there was an "inherent danger" of breaking "sub judice" rules, which prevent MSPs from speaking about active legal proceedings without the permission of the presiding officer.

Despite having neighbouring offices during the second assembly, he and former deputy presiding officer John Marek barely spoke after rowing about a departing official.

He was the first presiding officer, or speaker, of the new Welsh Assembly when it opened in 1999.

Speaking on BBC Radio Wales Breakfast on Wednesday, Millar said he had tried to give an example of a case "before being interrupted, I thought inappropriately, by the presiding officer".

The presiding officer – who decides which legislation is within the competence of the Scottish Parliament – has previously said she is confident the bill is within the powers of Holyrood.