Victoria Atkins struggled to explain why Britain has one of the highest national debts in the world.
"If Labour announced this without saying where that money was coming from you'd be after them like a rocket."
Presenter Sophy Ridge was left speechless by the minister's answers.
Last week's council results point to a hung parliament at the next general election.
"I think we’re starting to gain the trust of the British public,” Lucy Frazer said.
"So you can't name a single thing the government's done wrong?" Sophy Ridge asked Mark Harper.