Upadhyay, however, dismissed the allegations, saying it was "nothing serious" and party will look into it.
"I have received the letter but I am yet to go through it. It is the party's internal matter and we will look into it. Nothing serious about it," he said.
Meanwhile, Gupta said he will raise the matter in the party's forum.
"I have learnt it from Prime Minister Narendra Modi that we should neither indulge in corruption nor be scared of corrupt forces," he said.
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