With files from Mickey Djuric, Laura Osman, Dylan Robertson and Simon Hopkins CANADIAN PRESS Testy exchanges between the prime minister and his chief opponent ended with the Opposition leader and one of his MPs being ejected from the House of Commons on Tuesday — and the rest of Conservative caucus walking out of the chamber in protest. The unusually tense events saw Speaker Greg Fergus caution both Prime Minister Justin Trudeau and Conservative Leader Pierre Poilievre to rephrase their comments to avoid making direct accusations about the character of another MP. Fergus issued a warning to Poilievre after he referred to Trudeau as “the guy who spent the first half of his adult life as a practising racist,” referring to photos that emerged during the 2019 election of Trudeau dressed…