On a mission to bring together opposition parties who have no love lost for Congress, Bihar Chief Minister Nitish Kumar today reached the West Bengal state secretariat in Kolkata to meet Chief Minister Mamata Banerjee in his push to forge a grand alliance against the BJP. His deputy, RJD's Tejashwi Yadav, also accompanied him on the brief visit. They are later scheduled to fly to Lucknow to meet Samajwadi Party chief Akhilesh Yadav. Both Trinamool Congress and SP have not been keen on sharing space with the grand old party.