OTTAWA—The federal ethics watchdog is reviewing a request to investigate Prime Minister Justin Trudeau over payments his MPs offices made to a company owned by his friend. Conservative MP Michael Barrett wrote to ethics commissioner Mario Dion asking he launch an inquiry into the prime minister’s possible involvement in awarding contracts to Data Sciences Inc. The company was founded by Tom Pitfield, a childhood friend of Trudeau’s, who served as the Liberal party’s chief digital strategist during the 2015 and 2019 election campaigns. The Globe and Mail reported last month that MPs’ expenditure reports showed most of the Liberal caucus had paid money through their office budgets to the company, which has also been hired to provide digital services to the Liberal Party of Canada. Trudeau has said caucus members use Data Sciences for their constituency work and he and the party both say there is a complete separation between …