The penultimate week of campaigning for the Federal Election has seen tense drama, high emotions and more heads rolling.

Prime Minister Scott Morrison and Opposition Leader Bill Shorten went head-to-head in the third and final televised debate before the May 18federal election.

 There were plenty of talking points both old and new, including leadership instability, franking credits, health care and even Israel Folau.

 When it came to what could be the defining issue of this campaign, both leaders agreed climate change is real, but that's where the agreement seemed to stop.