Canadian Liberal Prime Minister Justin Trudeau, trailing in opinion polls, attacked his main rival on Monday for waffling on gun control and vaccine mandates as the campaign enters its final stretch ahead of the Sept 20 election.

Conservative leader Erin O'Toole on Sunday scrapped a campaign promise to eliminate a ban on some assault weapons, a sensitive issue in Canada after mass shootings in recent years. Trudeau sought to capitalise on his opponent's shift with just two weeks left to reverse his fortunes...