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OTTAWA — There should be limits on the use of the notwithstanding clause that is being increasingly invoked by provinces to curtail people’s Charter rights, argues the federal government in response to the challenge of Quebec’s secularism law at the Supreme Court. In its first legal intervention in the lengthy challenge of Quebec’s controversial law, the federal government argued in submissions filed Wednesday that the Supreme Court should set out limits of Section 33 of the Charter of Rights, known as...