Prime Minister Justin Trudeau speaks during an announcement at the offices of telecommunications firm Ericsson Canada in Kanata, Ont., on April 17.LARS HAGBERG/Reuters Prime Minister Justin Trudeau cited the internment of Japanese- and Italian-Canadians during the Second World War on Monday as he urged caution in the face of growing calls for Canada to adopt a registry to track foreign influence efforts. Speaking at a news conference in the Ottawa suburb of Kanata, Trudeau acknowledged the federal government must find better ways to protect Canadians following reports of alleged interference by China in recent Canadian elections. But the prime minister...