LIVE: Gerald Butts Testifying

Gerald Butts, principal secretary to Prime Minister Justin Trudeau, takes part in a meeting with Chinese Premier Li Keqiang (not pictured) in the cabinet room on Parliament Hill in Ottawa on Thursday, Sept. 22, 2016. Prime Minister Justin Trudeau's former principal secretary Butts is asking to testify on the SNC-Lavalin affair.THE CANADIAN PRESS/Sean Kilpatrick

OTTAWA – Close Prime Minister Justin Trudeau advisor Gerald Butts is testifying in front of the justice committee amidst a political crisis that has rocked Canadian politics.