The killing of Sikh temple leader Hardeep Singh Nijjar in Canada has sparked a diplomatic dispute between Canada and India. Nijjar, who was a prominent advocate for Sikh separatism in India, was shot and killed in a professional-style attack. Canada has accused the Indian government of orchestrating the killing, citing intercepted communications of Indian diplomats as evidence. The dispute threatens to strain Canada's relationship with India and disrupt President Joe Biden's efforts to strengthen ties with India.