Labour has accused the Government of trying to sell off New Zealand laws, and the Green Party has said the deal with result in an increase in problem gambling.
Economic Development Minister Steven Joyce yesterday denied the Government was selling the law, but said the deal would not go through unless extra pokie machines were allowed at the casino.
Casino regulations were tight and any move to increase the number of gaming machines would require legislative change, he said.
"That's just the nature of that industry _ it's different to other industries where those sorts of things don't apply,'' he told TVNZ's Q+A programme.
"Governments alter laws all the time to encourage economic activity to take place. So this whole sell-the-law thing is a Labour Party spin and you shouldn't buy into it.''
The deal could allow SkyCity to install up to 500 new pokie machines, but Mr Joyce said no numbers had been agreed while negotiations with Ministry of Economic Development staff were ongoing.
The SkyCity bid was one of five proposals to build the convention centre but the only one the Government was considering.