Bengaluru, Aug. 3 -- BJP MP and former Karnataka Chief Minister Basavaraj Bommai has hit out at the Congress, accusing it of undermining constitutional institutions by raising unsubstantiated claims of voter fraud. Addressing the media in Bengaluru today, Bommai challenged Congress to release any evidence it claims to have. "If it's an atom bomb, let them detonate it. If it's with them, it might explode right there," he said, questioning Congress' repeated allegations. He criticised the Congress for initially targeting EVMs and now the Election Commission without presenting formal complaints. "State officials serve as electoral officers. Political parties appoint booth agents. Alleging EC bias without proof is wrong. If there were issues w...