The NSW National Party is openly urging the Liberals to not field a candidate in the by-election for the federal seat of Lyne, vacated by the former Nationals leader Mark Vaile.
The Nationals fear a disruptive campaign if the Coalition partners both contest the by-election, to be held on September 6.
The Liberal Party is due to decide today whether to contest the seat, while the Nationals preselection will be held tomorrow.
The former Port Macquarie mayor Rob Drew is the favoured Nationals candidate.
Port Macquarie state independent, Rob Oakeshott said yesterday he would decide next week if he would stand.
Labor is unlikely to contest the seat.