The Government's majority to pass asset sales legislation is "rock solid" despite the Maori Party's opposition, Prime Minister John Key says.
Labour is claiming the wheels are coming off and the government is unstable because it will have a majority of just one vote to get the legislation through Parliament.
"If the Maori Party walks away the government will be kept intact by Peter Dunne and John Banks," Labour leader David Shearer said.
United Future leader Mr Dunne and ACT MP Mr Banks have signed support agreements with the government.
"It's a lot less stable than the last government was and they're already looking like losing one of their coalition partners," Mr Shearer said.
"It's of Mr Key's own making because he's pushing asset sales."
The Maori Party's three MPs are threatening to break their support agreement unless Treaty of Waitangi clauses are put in the legislation covering the partial sale of four state-owned energy companies.
Mr Key says he's "extremely relaxed" about his majority.
"It's made up of 59 National MPs, Mr Dunne who worked well with us for the last three years and Mr Banks who is well known to us," he said.
"Those 61 votes are rock solid."
Mr Key says he's sure an "elegantly simple" solution will be found to the Maori Party's problem with treaty clauses.
"When you ask me these questions in three years' time I will have a government that's supported by the Maori Party on confidence and supply - I don't think it's breaking down," he told reporters.
NZN