Rob Ford’s ability to lead the country’s largest city is again in doubt after his admission that he’s returned to drinking and the emergence of two new videos – including one showing an incoherent mayor cursing the chief of police.

After months of turmoil from Mr. Ford’s crack-cocaine scandal in May, Toronto City Hall had settled into a new normal, with the mayor’s powers divided between Mr. Ford and Deputy Mayor Norm Kelly. And for weeks, the mayor, who has shed 40 pounds, has insisted that he’d turned a corner, and was front-and-centre during last month’s ice storm. But his attempt to put the past scandal behind him was derailed Tuesday, with the emergence of the latest videos.