Ukip leader Nigel Farage has repeatedly challenged the Prime Minister to a televised debate.
His most recent call to face Cameron on air came last week in response to claims he was "chicken" for ruling out a run at Parliament in the Newark by-election.
The Ukip leader said: "Mr Cameron said ... that I was a chicken. Well, I'll tell you what Dave, why don't you come on telly and do a debate with me?"
More top news
A new scam aimed at people who own Apple iPhones steals their account information through a text.
Tomorrow’s Congress is expected to be dominated by claims of North Korea’s nuclear prowess.
The acclaimed conductor will direct the Mariinsky Theatre's Symphony Orchestra at the UNESCO World Heritage Site.