The foreign minister, Alexander Downer, and the trade minister, Mark Vaile, will learn today whether they must face the Cole inquiry.
Both ministers officially tendered confidential statements to the inquiry over the wheat scandal with Iraq yesterday.
The commissioner, Terence Cole, has set a deadine of 1pm today for other parties' lawyers to make applications to cross-examine them.
Both ministers have previously expressed a willingness to appear as witnesses.
The inquiry has heard the Government was warned six years ago about claims that A-W-B was paying kickbacks to Saddam Hussein's government.
A United Nations inquiry last year found the Australian wheat exporter had paid his government almost 300 million dollars in kickbacks.