Yadav shared a picture on his Twitter handle of the Union Minister along with Vishun Roy College principal Bachcha Rai, who is said to be the mastermind behind this scam.
"Sharing pics of aid of toppers scam culprit& renowned central minister. Hope few media houses wil not hsitate to do character assassination. Modi's fav minister with scam accused & his father. He is bus partner and family friend of main culprit Baccha Rai," he tweeted.
Quoting a Hindi daily, the Deputy Chief Minister further said Rai had cordial relation with Giriraj Singh, who regularly joined his college functions to distribute prizes to the toppers.
"Who is this central minister of BJP, the close associate of main culprit of inter topper scam? The main culprit has cordial relation with a central minister who regularly joins his college functions to distribute prizes to toppers," he said.
Further escalating attack on the BJP MP, Yadav said all the malpractices of the college were taking place probably by his encouragement.
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"ModiJi's Minister wanted to open a Med collage with culprit. Lacs of ppl join our election rallies. Does BJP do a character check of all joining their rallies? BJP cried foul based on a random pic," he added.
Amid mounting pressure with regard to alleged irregularities in the 10+2 examinations, Bachcha Rai surrendered before the police yesterday.
An FIR was registered against four students and the director of the college in connection with the scam.
The four students against whom the case has been registered are Sourabh Shrestha, Rahul Kumar, Ruby Rai and Shalini.
Following the furore over the Bihar Board examination toppers being unable to answer basic questions related to their stream eventually leading to a re-examination, Chief Minister Nitish Kumar had last week said the guilty won't be spared, adding the investigation into this matter will be done with a criminal angle.
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The Bihar School Examination Board ( BSEB) earlier on June 4 cancelled the results of two toppers, including Sourabh Shrestha, of the Intermediate (Science) examinations after they failed to prove their merits in a re-test.
The board had on June 3 asked Sourabh and his college mate Rahul Kumar, who were among the 13 toppers from the arts and science streams in the Class XII examinations, to reappear in a re-test following a controversy over their merits.
Saurabh Shrestha from the Science stream, who had secured 485 out of 500, was caught on camera failing to answer basic questions.
Ruby Rai, the arts topper, from the same college failed to take the re-test on Friday citing health reasons.
Rai had secured 444 marks out of 500 in the Arts stream. However, on camera she did not even appear to know the number of subjects in her course