"In theory, but one would hope it wouldn't come to that," he said. "At the end of the day that's not the preferred option."
In Parliament yesterday, Labour deputy leader Grant Robertson asked Deputy Prime Minister Bill English whether the pledge not to legislate would stand whatever rights a court may decide Maori had in terms of water.
Mr English did not directly answer that question but was later asked whether he would rule out passing legislation in response to a court ruling that found an iwi owned a waterway.
He responded by saying: "Well yeah, we've said we're not going to legislate over rights and interests."
Mr Robertson later told the Herald it was clear that Mrs Turia had walked away from her meeting with Mr Key this week with the impression the Government would not legislate against any court decision upholding Maori proprietary rights over a waterway.
But Mr Robertson said Mr Key's comments and Mr English's reluctance to answer direct questions yesterday cast some doubt on that.
"We now have some confusion about that. The Government needs to make its position clear. The big decision they have to make is is there a limit to what they're prepared to simply leave as being a court decision?"