Rahul Gandhi, leader of India's opposition Congress party, said on Wednesday he had asked party bosses to find a successor after he took responsibility for losing a general election that has left the party in crisis.
Data released by the Reserve Bank of India showed that almost the entire amount of withdrawn currency had returned to banks, meaning Modi may have misjudged cash hoarding.
India's ruling party will make gains in a key election to rule the southern state of Karnataka but fall short of a majority, an opinion poll showed.
India's main opposition Congress party on Monday elevated Rahul Gandhi, the scion of the country's most fabled political dynasty, as its president, preparing to challenge the dominance of Prime Minister Narendra Modi ahead of national polls in 2019.
The comment came ahead of a vital test of popularity for Modi after a series of controversial economic reforms when Gujarat -- the state where he forged his political career -- goes to the polls on Saturday.
Indian Prime Minister Narendra Modi's ruling party won power for the first time in the northeastern state of Assam, a victory that will help his government recover some reform momentum after poll losses last year.
India's opposition Congress party staged a show of defiance on Friday, with Sonia and Rahul Gandhi leading a rally and march to parliament.