Pathak joined the saffron organisation in the presence of its president Amit Shah and Union minister Mahesh Sharma and was described as a "pillar" in the Hardoi-Unnao region of the state. Assembly polls in UP are scheduled next year.
Sharma said Pathak joining BJP will help the party consolidate its vote bank.
Even though he was at the BJP headquarters fulfilling his joining formalities, BSP expelled him for the party, apparently after coming to know of his plans.
"I thought any delay will be harmful. Only Prime Minister Narendra Modi's developmental agenda and Amit Shah's efforts can rescue UP," he told reporters here.
Asked about his presence in the BSP rally yesterday and he joining BJP is less than 24 hours, he said he was doing his job in BSP as long as he was there.
Pathak said he had played a role in swinging Brahmin voters to BSP during the 2007 Assembly polls, but Brahmins were disappointed by the party.
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