It's odd that this item implies that Harper is laying down the gauntlet, but I think it's Sun News. They're paid to lie.
Harper challenges Ignatieff to debate showdown
What I did find interesting was his comment:
"We could also have a debate between Mr. Ignatieff and myself, since, after all, the real choice in this election is a choice between a Conservative government or an Ignatieff-led government that all of these other parties will support.How is it a bad thing if a prime minister has the "support" of other parties? Isn't that how Parliament is supposed to function?