Pressure is increasing on the Coalition’s Longman by-election candidate to stand down, after more revelations about his claims of being awarded a military medal.

Labor frontbencher Jim Chalmers today called on Trevor Ruthenberg to quit the race, and if not, for Malcolm Turnbull to have him disendorsed.

Mr Ruthenberg this week apologised for what he called an “honest mistake" , after incorrectly listing on his previous Queensland Parliament web site that he had received the more distinguished Australian Service Medal.

Trevor Ruthenberg has continued on the campaign trail with Veterans Affairs Minister Darren Chester in Bongaree. Picture: Facebook (Facebook)

It was in fact the Australian Defence Medal, handed to all service men and women who serve four years.

The Courier-Mail has revealed he made the same “mistake” on a second web site.

Mr Ruthenberg, considered a good chance of winning the seat from Labor, said he was no “military imposter”.

“He has been caught out lying,” Mr Chalmers said.

“He tried to pretend it was some kind of one-off mistake.

Mr Chester issued an apology to his constituents on his Facebook page earlier this week. Picture: Facebook (Facebook)

“It wasn’t one-off. It wasn’t innocent. It wasn’t honest.

“He should stand down and if he doesn’t do that, Malcolm Turnbull should show some leadership and show some integrity for once in his life and disnedorse him.

“If the candidate was an honest, decent person, he would stand aside.”

Mr Turnbull this week accepted his candidate’s explanation, saying Mr Ruthenberg was “as honest as he is big”.

The LNP said Mr Ruthenberg’s personal website simply reflected the same error he’d already apologised for.

“Trevor Ruthenberg has corrected the record, and apologised,” the spokesman told the Courier-Mail.