Investigators say five people were killed, including a nine-year-old girl, in an attack in Germany when a car rammed into a crowd at a Christmas market. More is being revealed about the man police have arrested — but there are still questions about what might have motivated the apparent attack. Plus, the question gripping Ottawa is whether Prime Minister Justin Trudeau will stay on as leader? If he does decide to bow out, who will take over and what will that process look like?