Cairns, who was last month cleared of match-fixing related perjury charges, has demanded McCullum explain why he chose to appear as a prosecution witness.
     
Speaking for the first time since the verdict 10 days ago, McCullum said he was 'very comfortable' with the evidence he gave and it was time to move on.
      
"For me, it wasn't about whether someone was guilty or not guilty. My role was to go and give the evidence in the trial and I remained pretty unemotional about it, to be honest," he said in Dunedin as he prepared to lead New Zealand into a Test series against Sri Lanka.
     
"I don't think my reputation has been on the line during the whole thing. I was one of a number of witnesses who gave evidence," he added.
     
While journalists wanted answers about the Cairns trial, McCullum wanted to talk about the first Test against Sri Lanka starting tomorrow.

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