Pankaj Niranjan Singh Chandel, the son-in-law of Patel, joined the Congress in the presence of party president Rahul Gandhi and general secretaries Priyanka Gandhi Vadra and Jyotiraditya Scindia. Patel was also present there.
Shah said the second seat would be finalised later after deliberations between leaders of both the parties.
Uttar Pradesh has 80 Lok Sabha seats.
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