By Catherine Morrison A new report by the Canadian Centre for Policy Alternatives says the federal public service could shed almost 60,000 jobs over the next four years as Ottawa looks to cut costs. Earlier this month, Finance Minister François-Philippe Champagne sent letters to multiple ministers asking them to cut program spending at their departments by 7.5 per cent next spring, 10 per cent the year after and 15 per cent in 2028-29. The report, written by senior economist with the Canadian Centre for Policy Alternatives David Macdonald, says the federal public service could lose up to 57,000 employees by 2028. The report predicts that tens of thousands of jobs will be cut at the Canada Revenue Agency, Employment and Social Development and Immigration, Refugees and Citizenship Canada — three…