Deputy Chief Minister of Maharashtra, Devendra Fadnavis, said on Saturday that whenever Sharad Pawar's party becomes weak, he joins the Congress and later leaves it. Clarifying that Prime Minister Narendra Modi has not made an 'offer' to NCP (SP) chief Sharad Pawar, but 'advised' him to join the NDA, the senior BJP leader said, "From 1977 till date, we have seen that whenever Sharad Pawar's party weakens, he merges with the Congress and then exi…