John Key is publicly dismissing Winston Peters' message to make sure every National MP signs up to any deal New Zealand First might make with that party after the elections.
But privately he will be taking notice.
Mr Key's initial response to Mr Peters' cheeky condition was that "I will manage our caucus, not Winston".
Speaking to Taupo Rotary on Monday, Mr Peters said: "Before we could go with National we would make every single MP in the National caucus sign up to whatever agreement was reached."
At first glance, Mr Peters appears to be setting demands that no self-respecting leader could meet, and a demand that could indicate he was favouring Labour.