Along with Gupta, several other leaders joined the BJP in presence of Union Minister Hardeep Singh Puri.

Gupta left the Congress last month alleging "constant humiliation" and "character assassination" by a Congress leader connected with the party's communication department.

Gupta joined the BJP days after other former Congress spokesperson Gourav Vallabh joined the BJP ahead of the Lok Sabha elections.

In the letter, Vallabh, while alleging that the party was moving in the wrong direction, said, "On the one hand, we talk about the caste-based census, and on the other hand, the party seems to oppose the entire Hindu society. This style of working gives a misleading message to the public that the Congress is a supporter of a particular religion only. "

He said that he was shocked when the party declined to be a part of the consecration ceremony of Lord Ram in Ayodhya.

"I am a Hindu by birth and a teacher by profession. The stand of the party on this made me uncomfortable and troubled me," he wrote to Kharge.