One Nation co-founder David Ettridge's bombshell $1.5 million legal action against Opposition Leader Tony Abbott is looming as unwanted distraction as the prime minister-in-waiting presses home his electoral advantage against the Gillard government.

Ettridge, alongside former Abbott staffer David Oldfield, was the other half of the "two Davids" that set up One Nation in 1997 as a vehicle for Pauline Hanson's dubious political ambitions.

But Abbott had his own fightback forum -- Australians for Honest Politics -- convened soon after to destroy Hanson and her party through legal action focused on its dubious Australian Electoral Commission registration. The $100,000 fund aimed to protect the Coalition's vote at the 1998 federal election from a devastating right-flank assault.