A national security probe has been launched into the office of Immigration Minister Judy Sgro after a senior staffer was quietly fired for suspicion of being a threat to the country, government officials say. The staffer, a Canadian of Sri Lankan origin, had worked for several weeks in Sgro's Ottawa office, according to sources close to the case. Sources said the Toronto man, whose identity hasn't been released, was given a top position because he was a tireless recruiter of South Asians for the Liberal Party of Canada (Ontario). Six sources, including police, a Liberal and Conservative MPs and immigration...