Liberal Leader Michael Ignatieff has announced he will address Saturday's anti-prorogation rally in Ottawa organized by an online social networking group.

During a Liberal-run virtual town hall on Thursday, Ignatieff confirmed he would speak at the rally planned by the Facebook group Canadians Against Proroguing Parliament (CAPP).

"Canadians want their MPs back at work and they want their prime minister to be accountable to Parliament," he wrote.

The grassroots movement began on Facebook in late December, soon after Prime Minister Stephen Harper suspended Parliament until March.

The group, which currently has more than 200,000 Facebook members, has planned rallies from St. John's, N.L., to Whitehorse, Yukon.

NDP foreign affairs critic Paul Dewar and Green Party Leader Elizabeth May are also slated to speak on Parliament Hill.

Members of CAPP's Toronto chapter announced at a news conference on Thursday that this weekend's protest would include a march Saturday in the area of Yonge-Dundas Square in the downtown core.

Canadians living abroad have also organized rallies in cities outside Canada, including New York, San Francisco and London.