Morning Update: A combative debate night in America

Good morning. Kamala Harris introduced herself – and her prosecutorial chops – to Donald Trump last night at the U.S. presidential debate. More on that below, along with the NDP’s need for distance from a “radioactive” Justin Trudeau and tricks for overcoming adversity from the wild. But first:Today’s headlines

• Mélanie Joly says Canada will block U.S.-bound arms sales destined for Israel
• Liberals face a must-win by-election in Montreal as they try to hold onto their base
• For wild horses, Alberta’s arguments over agriculture and ecology are a matter of life or death