A Liberal MP has performed a sensational backflip on a motion against radical extremism after introducing the issue herself.

Gabrielle Upton promised to 'disarm' dangerous extremists and hate preachers following the murder of NSW Police accountant Curtis Cheng, saying the Australian way of life is under threat.

'We cannot allow violent race hate speech to fan flames of division and tear our community apart,' she said in 2015.

However, the Environment, Local Government, and Minister for Heritage stunned her 'bewildered' constituents in a cabinet meeting a fortnight ago, slamming the laws she introduced, the Daily Telegraph reported.

A Liberal MP has performed a sensational backflip on a motion against radical extremism after introducing the issue herself

Gabrielle Upton promised to 'disarm' dangerous extremists and hate preachers following the murder of Curtis Cheng (pictured left), saying the Australian way of life is under threat

Radicalised 15-year-old Farhad Khalil Mohammad Jabar shot dead Mr Cheng in 2015

Upton was vehement in ensuring attacks similar to the shooting at the Parramatta police station would not happen again, saying Australia had an obligation to be 'vigilant to and guarding against the spread of racial vilification­.'

Attorney-General Mark Speakman attempted to introduce the issue in a meeting in early December, but was rebuffed by Upton who said it was not the time to be discussing such a topic.

Upton instead wanted to discuss the NSW government's decision to approve a $2 billion demolish-rebuild for ANZ and Allianz Stadiums, ignoring the issue she so strongly fought for two years ago.

Upton instead wanted to discuss the NSW government's decision to approve a $2 billion demolish-rebuild for ANZ and Allianz Stadiums, ignoring the issue she so strongly fought for two years ago

Several ministers were shocked by the backflip, saying cabinet members were 'confused' by her change of heart.

'Speakman was a bit bewildered. He was confused as to how people have confused free speech with racial vilification,' a Cabinet minister told the Daily Telegraph.

The attempts to change the Anti-Discrimination Act were also objected to by Dominic Perrottet and other ministers, based on it impeding on free speech, and successfully had the agenda thrown out.