Canada’s former ambassador to China recently accepted a top appointment with a mining giant which does over half of its sales in China. Now, two MPs are asking the Ethics Commissioner to probe the issue to determine if any conflict of interest rules were broken. NDP MPs Heather McPherson and Matthew Green wrote a letter to commissioner Mario Dion highlighting areas of concern such as the string of events ahead of ex-ambassador Dominic Barton’s new appointment. McPherson is NDP critic for foreign affairs and Green is the ethics critic. Barton met with executives from the Anglo-Australian mining company Rio Tinto in October 2021, according to a Globe and Mail article published last month. Barton announced on Dec. 6 he would be stepping down from his Beijing post by year end. Rio Tinto announced Barton was appointed chair of the company on Dec. 19, saying he would join the board in April …