Napier's Labour candidate Stuart Nash and former cabinet minister Rick Barker will square off in an "old town hall style debate" on amalgamation in the city on Friday.
Mr Nash has used the amalgamation issue to raise his profile in recent months through a prominent billboard campaign opposing the merger of the region's local authorities into a single super council.
He complained last week that vandalism attacks on the signs were politically motivated.
While he and Mr Barker have opposing views on amalgamation, it is unlikely their Friday debate will feature many political attacks on either side, as both have similar red roots.
Mr Barker was a long-serving Labour MP for Tukituki and a cabinet minister in Helen Clark's government. He is currently a Hawke's Bay regional councillor.