Deputy Opposition Leader Julie Bishop "absolutely" stands by her claim she has never had a relationship with a client, despite attending a legal interview with her current partner (and former Perth lord mayor) Peter Nattrass in relation to how he obtained information on the criminal record of a council candidate.

Bishop led the opposition's prolonged attack on Julia Gillard this week over her role in establishing a slush fund with then-partner Bruce Wilson in the 1990s. On Tuesday, Bishop told the media that unlike the Prime Minister she had never had a relationship with a client.