"We welcome them to the party and I think their presence will further boost our campaign in Delhi and Khan's presence also validates the ideology of the party towards people," Vardhan said.
Chaudhary, when asked why she has been switching parties, said, "I had an ideological difference with RLD chief Ajit Singh so I left his party. And, moreover, I am impressed with the working style and policies of our PM, especially the 'Beti Bachao' campaign and 'Jan Dhan Yojana'."
She has earlier served twice as a cabinet minister in the Uttar Pradesh government.
Upadhyay, meanwhile, attacked AAP chief Arvind Kejriwal accusing him of "spreading lies" and said that "this election would now be about lies versus the truth."
He said that the Election Commission had sent him a notice and "expressed its displeasure" over some of his utterances related to election campaigns.
"Kejriwal had said that BJP was trying to communalise areas like Nagloi, Bawana. He (Kejriwal) had also resorted to personal attacks...And, I must tell you that the EC has taken cognisance of such remarks and called it a complete violation of the Model Code of Conduct.
"It (EC) has censured him and expressed his displeasure over such utterances and asked him not to do so in future," he said.
The poll watchdog yesterday also issued him a fresh show cause notice for his repeated alleged statements that while people should accept bribe from BJP and Congress, they should vote for AAP.
Referring to Kejriwal's comment he said, "this was a great disrespect to the sentiments of the common voters."
"He is creating confusion and illusion among the voters and the media and he should stop it. And, I say he should tender a public apology to the people of Delhi," Upadhyay alleged.
Besides the two leaders, a social worker Chandra Rekha Tiwari from Badarpur also joined the party.