The Prime Minister could be called before the Cole inquiry as early as Thursday, after being asked to give a sworn statement to the commission.
John Howard has until 4 pm today to provide the statement, outlining what he knew about million of dollars in kickbacks paid by the Australian wheat exporter, AWB to Saddam Hussein's Iraqi regime.
The Foreign Minister Alexander Downer is due before the inquiry this afternoon, following the appearence of his cabinet colleague Mark Vaile.
The first minister to front the commission, Mr Vaile responded to questioning by telling the inquiry 21 times he couldn't recall warnings that the AWB might be paying bribes.
But he still maintained the government was being open.
"My appearance here following my submission to the inquiry is proof of that."
"We've said that it's an open and transparent process, we've established in Australia but not too many other governments around the world have done. This is proof positive of that."