Prime Minister Tony Abbott has called a media conference for 4.30pm AEST where it is expected he will address the latest issues surrounding Speaker Bronwyn Bishop and possibly announce he has lost confidence in her.

This comes after weeks of standing by the embattled veteran MP, who has been under fire for abusing parliamentary entitlements, including hiring a $5000 helicopter ride for a Liberal fundraiser from Melbourne to Geelong.

Prime Minister Tony Abbott will address the media on Sunday afternoon. Credit:Andrew Meares

Labor has been demanding her dismissal following the string of revelations but the prime minister as late as Friday said he would be standing by the "deeply remorseful" and "very, very chastened" Speaker.