What does ministerial accountability mean?

NDP MP Ryan Cleary thinks Peter MacKay should resign.

"The email trail that has been released doesn’t back up his story," Cleary, a New Democrat, told CBC News Friday. "It looks like he lied about it, that’s how it looks. So when you have a federal minister of Canada come out and tell one story and a chain of emails indicate another story and it looks like he’s lying, I think that he has to resign," Cleary told reporters in St. John’s.