Productivity and Labour Relations Minister Yvonne Henderson says the Opposition is running scared on its industrial relations policy.
Mrs Henderson said it appeared Liberals had discovered that workers did not like what it was proposing, and was trying to bury the policy until after the election.
She said Opposition spokesman Graham Kierath had gone to extraordinary lengths to mislead the Civil Service Association about the Opposition's intentions.
"I have never heard of a politician promising to drop policies if people decided they did not like them," Mrs Henderson said.
"But that is what Mr Kierath has done by saying he will abandon the Liberals' industrial relations policy if it causes industrial trouble.
"This is the same man who says he would resign if one government employee lost his or her job through the Liberals' plan to privatise government agencies.
"He is simply unbelievable, and his promise to scrap the Liberals' radical industrial relations policy confirms that.
"Labour market reforms go to the heart of `Fightback'. It is the Liberals' raison d'etre.
"There is no way it would be jettisoned because of its unpopularity - and it would be highly unpopular."
Mrs Henderson said that if the Opposition was too scared to stand by its policies in public it should change them - not try to kid people that they would not be implemented, or would be dropped if people did not like them.