Open this photo in gallery: Polish Prime Minister Mateusz Morawiecki speaks during a news conference in Bulboaca, Moldova, on June 1.Andreea Alexandru/The Associated Press Prime Minister Justin Trudeau is welcoming Polish Prime Minister Mateusz Morawiecki to Canada Friday as the federal Liberals keep quiet about a democratic backslide in his country. “There is too much silence, and I think we are on the edge in Poland,” said Marcin Gabrys, a political scientist with Jagiellonian University in Krakow. “How can you have a shared commitment to democracy when there is a clear threat to the electoral process?” Gabrys, who specializes in...