After Congress lost the Haryana Assembly polls, the party questioned the electoral process and the authenticity of the electronic voting machines (EVMs). Later, the Election Commission branded Congress's allegations as 'frivolous doubts'.
On Thursday, Congress president Mallikarjun Kharge now alleged that Prime Minister Narendra Modi was winning the elections by resorting to "fraud".
The Congress veteran also referred to business tycoon Elon Musk's statement questioning the genuineness of EVMs to support his claim.
"Modi hasn't won a by-election. Everything is fraud. He gets 10,000 names removed from the voter list or gets 10,000 to 20,000 new names added. This is the truth but the question is how to prove it," Kharge said at the Congress Bhavan here.
He was speaking at an event to pay tribute to former Prime minister Late Indira Gandhi and Deputy Prime minister of India Sardar Vallabh Bhai Patel.
Kharge said Musk, a tech expert, had said EVMs could be altered and hacked through computers.
He added that no major western nation such as the US, Canada, Britain, Germany, France or Italy used EVMs.
The Congress chief took a dig at the BJP leaders for defending EVMs everytime.
"They (BJP) say when we win we don't blame EVMs and don't demand ballot papers as in Telangana and Karnataka but when the BJP wins blame EVMs," Kharge said.
The veteran leader said, "We know their programme (strategy). They know what to do, where and to whom."
Kharge also accused Modi of "dividing" people instead of uniting them on the basis of religion and caste.
