The Labour staff member accused of bullying and sexual assault has resigned from Parliament.

"I have enjoyed my time working in Parliament, but today I have made the very difficult decision to resign because of the stress of the situation," he said in a statement Thursday.

He said he does not wish to be a distraction to the work of the Government.

"I adamantly refute the serious allegations made against me. I cooperated fully with the initial inquiry," he said.

"I am cooperating fully with the inquiry that is now underway, and will continue to do so, having been assured that this process will be fair to all parties."

More to come.