Queensland Premier Campbell Newman is backing his police minister who is accused of manufacturing an official event in Cairns to coincide with a personal trip.

Labor's Bill Byrne asked Jack Dempsey last week in a budget estimates hearing whether he instructed staff to prepare official business, which would enable him to use his government travel allowance.

An email from Mr Dempsey's senior media adviser to police media on May 21, 2012, explained that the minister was visiting Cairns on a personal trip and asked if there was a "quick event we can throw together for this?".

The visit, on May 26-27, was Mr Dempsey's first to Cairns as police minister.

He met emergency service workers and police.

Mr Newman believes the case is closed and Mr Dempsey doesn't have any questions to answer.

"He was the new police minister, getting going in the job, and I have no problems what he was doing in terms of asking what the availability was to go out and talk about local issues," Mr Newman said.