OTTAWA—Two-thirds of Canadians want prospective immigrants to be screened for “anti-Canadian” values, a new poll reveals, lending support to an idea that is stirring controversy in political circles. Conservative MP Kellie Leitch, a candidate in her party’s leadership contest, has floated the idea of screening newcomers for their attitudes on intolerance toward other religions, cultures and sexual orientations and reluctance to embrace Canadian freedoms. A new Forum Research Inc. poll for the Star shows that Leitch may be tapping into an idea that Canadians favour with 67 per cent saying immigrants should indeed be screened for “anti-Canadian values.” More importantly...