Another secretly-taped conversation with National's deputy leader has emerged in which Bill English expresses concerns about US presidential candidate Barack Obama's approach to international relations.
The recording is one of at least five made at National's annual conference in August and leaked to TV3.
In the conversation, Mr English says he is a bit worried about Mr Obama because there is a limited effectiveness in being moralistic about international relations.
Mr English goes on to say there still needs to be someone who is willing to pull the trigger.
"I'm a bit worried about this whole Obama and Europe thing because there is a limited effectiveness in being moralistic about international relations and Europe has turned out to be particularly ineffective in its own backyard and the US.
"You can argue overdo it and Bush should have put a different window dressing on it - there still needs someone who's willing to pull the trigger."
National's leader John Key has dismissed the tape as another dirty campaign trick by Labour.
Mr Key says he is convinced Labour is responsible for all the tapes.