Victoria’s Attorney-General, Rob Hulls, is denying he has committed a serious breach of parliamentary rules, over the Windsor Hotel inquiry.

The clerk of Victoria’s Upper House has written to a parliamentary committee advising that Mr Hulls is in contempt of Parliament, by directing staff not to appear at the inquiry.

The inquiry is examining the leak of confidential media strategy document, that advised sham consultations about the hotel’s redevelopment.

Justin Madden’s former press secretary, Peta Duke was advised not to testify before the committee by the attorney-general.

But Mr Hulls says he has done nothing wrong.

“The Upper House knows full well, what the longstanding conventions and protocols are,” he said.

“That the ministers themselves are held to account before the committees, and not the ministerial advisers.”

He maintains he has followed the correct procedures and does not have a case to answer.

“The Liberal Party and the Greens are acting like bullies, wanting to drag this young woman in front of a committee in breach of all conventions, for their grubby political purposes,” he said.

“Not only are there only questions about the validity of the subpoena itself, and I’ve set that out in correspondence to the committee, but there’s also questions about the role of the chair of this committee.”

The State Opposition is calling for Mr Hulls to step down.

The planning spokesman, Matthew Guy, says Mr Hulls is setting a disturbing precedent.

“It really beggars belief that we have an Attorney General who is directing, bullying, intimidating people not to obey a legal subpoena, not to turn up after a legal summons has been issued,” he said.

“That is more a reflection of Rob Hulls and the Brumby Government, than anyone else.”