A simmering diplomatic row that has strained bilateral relations between India and Canada has resurfaced as the countries have expelled each other’s top diplomats over a year-long dispute about the killing of a Sikh activist in Canada.

MUMBAI, Oct 15 (Reuters) - India's main opposition Congress party has urged Prime Minister Narendra Modi's government to take all political parties into confidence regarding worsening ties with Canada a day after the two countries said they expelled each other's diplomats.

Although the tit-for-tat move sent bilateral relations skidding to a new low, Narendra Modi and Justin Trudeau are unlikely to mind too much. Both leaders are in their third terms and face political challenges.