Peter Slipper has stood aside as Speaker of the House of Representatives while allegations of “criminal behaviour’’ against him are investigated.

In a written statement, Mr Slipper denied secually harassing adviser James Ashby or misusing Cabcharge vouchers.

But the Liberal-turned-independent said he would stand aside while the Cabcharge allegations were investigated.

“I emphatically deny these allegations,’’ Mr Slipper said.

“These allegation include both an allegation of criminal behaviour and a claim under civil law.

“Any allegation of criminal behaviour is grave and should be dealt with in a manner that shows appropriate regard to the integrity or our democratic institutions and to precedent.

“As such, I believe that it is appropriate for me to stand aside as Speaker while this criminal allegation is resolved.

‘Mr Slipper says Deputy Speaker Anna Burke will act as Speaker during the investigation.