The head of Parliament's investigative panel has resigned in protest after the legislature put off a final decision on whether two former Cabinet ministers should be tried on corruption charges.

Egidio Sterpa said his resignation Thursday "speaks for itself."Sterpa had bitterly criticized Parliament on Wednesday after it overrode recommendations from his panel that Franco Nicolazzi, a former public works minister, and Clelio Darida, a former justice minister, be brought to trial before the Constitutional Court.

The case against the ministers involved millions of dollars in alleged bribes paid by an architect-contractor to obtain contracts for building prisons in the early 1980s. All three ministers denied any wrongdoing.