DAILY Roundup | Liberals' grocery tax, Conservatives surging, Masks back at McGill hospital

Today, we're looking at Prime Minister Justin Trudeau's threat to Canadian grocery retail giants, warning the companies they have until Thanksgiving to bring forward a plan to reduce costs or face new taxes.

Plus, the Trudeau Liberals are collapsing in the polls while the Opposition Conservatives are surging.

And finally, masks are making a comeback at Montreal's McGill University Health Centre, with health-care workers who interact with patients in clinical areas now forced to mask up.