Act leader Don Brash has dismissed suggestions John Banks is vetting his speeches as "garbage" after claims he ditched a speech on welfare at Mr Banks' insistence.
Mr Banks, Act's Epsom candidate, said on TV3's The Nation that he had seen some of Dr Brash's speeches and "told him he needs to stay on the economy because he's best qualified to talk on the economy".
He was speaking in response to a question about whether he had vetoed a speech by Dr Brash on welfare.
Mr Banks wouldn't confirm he had vetoed a specific speech, but said: "There's nothing wrong with giving speeches on welfare but Don doesn't have experience talking on welfare."
Last month, the two had a disagreement after Dr Brash publicly advocated decriminalising cannabis without advising Mr Banks, who is strongly opposed to such a stand.