Conservative Leader Andrew Scheer says Prime Minister Justin Trudeau's closest aides should be called to testify before the House of Commons justice committee on what they said to former justice minister Jody Wilson-Raybould about the criminal case against SNC-Lavalin. The prime minister has denied that anyone directed Wilson-Raybould to use special powers she had as the country's attorney general to get prosecutors to enter a plea-bargain-type agreement with the Montreal-based engineering giant to avoid criminal charges that it bribed Libyan leaders to get infrastructure work there.