The Bay of Plenty MP rolled former leader Simon Bridges last week, but says the party has not changed its stance on previous promises.
"That is absolutely National Party policy," Mr Muller told TVNZ1's Q+A with Jack Tame, when asked about the Government's 2018 policy to stop issuing new offshore oil and gas exploration permits.
The ban did not extend to current permits.
Muller is supposed to be one of the good guys on climate change in the National Party. Instead, this shows that he and the party are still not serious about climate action. After all, if you won't take the mildest of measures to decarbonise the economy - phasing out the supply of dirty gas over decades - then what hope is there that you'll move on carbon-free transport, or raising carbon prices, or on confronting the giant cow in the room?
But I guess it just goes to show: you can change the bald white man in charge, but underneath its the same dirty old National Party, clinging to the past and trying to destroy the future.