Ontario's health minister is turning up the rhetoric in the dispute with the province's doctors over a new fee arrangement.

Eric Hoskins is asking them if their demand for binding arbitration is important enough for them to agree to form a public sector union and disclose their salaries.

Doctors voted down a tentative deal earlier this month that included a 2.5 per cent annual increase in the physician services budget, partly because the arrangement didn't include binding arbitration.

In a letter to the Ontario Medical Association, Hoskins asked if the group wants the same binding arbitration rights that other public sector unions have, would they be willing to formally become a union and be subject to salary disclosure obligations.