India expels diplomat from Canada as relations plummet over Sikh leader's assassination

India's government strongly denied on Tuesday any involvement in the murder of a prominent Sikh leader in Canada and expelled a senior Canadian diplomat in a tit-for-tat response as tension between the two countries soars. Canadian Prime Minister Justin Trudeau drew India's ire by suggesting Indian officials could have had a role in the assassination of Hardeep Singh Nijjar.