A year after his ouster as the prime minister of Pakistan, Imran Khan on Monday said that he was cautioned by the ruler of a Gulf nation last year that the then Army chief Gen Qamar Javed Bajwa was conspiring to topple his government. On Sunday, Khan, who is the chief of Pakistan Tehreek-e-Insaf (PTI), issued a white paper on the one-year performance of the PML-N-led coalition and termed it the worst in the country's history.