Chief Election Commissioner Nasim Zaidi today underscored that the commission has not received any "credible evidence of tampering" in the Electronic Voting Machines. Last week, the commission had held an all-party meeting ahead of its hackathon challenge, which begins on June 3. Mr Zaidi, however, told NDTV that no party has submitted any names for the hackathon, even though they were asked to provide the names of three representatives. The Aam Aadmi Party of Arvind Kejriwal, which has been one of the prime critics of the voting machines, has objected to the Election Commission's ground rules for the hackathon. AAP's Sanjay Singh said the guidelines were akin to "throwing a person into sea after tying his hands and expecting him to swim".