OTTAWA—The Canadian Security Intelligence Service warns that it sees steady, and in some cases increasing, foreign interference by state actors against Canada. In a report released Thursday, CSIS says it has observed persistent and advanced state-sponsored threat activity targeting elections for many years and “continues to see a rise in its frequency and sophistication.” CSIS points to social media being leveraged to spread disinformation or run foreign-influenced campaigns designed to confuse or divide public opinion, or interfere in healthy public debate. The service advises that although Canada’s electoral system is strong, foreign interference can erode trust and threaten the integrity of the country’s democratic institutions, political system, fundamental rights and freedoms, and ultimately, its sovereignty. The spy service’s warning comes amid speculation Prime Minister Justin Trudeau will pull the plug on the minority Parliament in coming weeks, sending Canadians to the polls. “The Canadian public and voters are targeted by …