Addressing a poll rally in Karachi, the 65-year-old cricketer-turned-politician claimed that a "big game" is being played to hurt the credibility of the general elections and Sharif and others are behind this "conspiracy".
Senator Lindsey Graham said additional sanctions needed to be teed up before President Donald Trump holds a second meeting with Russian President Vladimir Putin after the US leader came under heavy criticism for failing to confront Putin about interference in the 2016 election at a summit last Monday.
An election candidate and his driver were killed by a suicide bomber in northwest Pakistan on Sunday, police said, three days before the country's general election.
Japan's severe heatwave killed at least 15 people and sent more than 12,000 to hospital in the first two weeks of July, official figures show as the temperature neared 40 degrees C (104 F) in many cities on Sunday.
