"These days BJP and RSS are chanting B R Ambedkar's name but their behaviour is opposite to that," Kumar said while addressing a function to mark the 125th birth anniversary of the father of Indian Constitution here.
"A Dalit student is pushed to commit suicide in a central university. Students are sent to jail on charge of sedition," Kumar said apparently referring to the suicide of scholar Rohit Vemula and the arrest of JNUSU President Kanhaiya Kumar.
Earlier in the day, Prime Minister Narendra Modi launched a village self-governance campaign at Ambedkar's birthplace in Madhya Pradesh.
"The party which came to power shouting 'sabka saath sabka vikas' got engaged in activities like love jihad, beef and nationalism-sedition," he alleged.
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"Those having no contribution in freedom struggle are trying to replace the tricolour with the saffron flag and bragging about patriotism," claimed Kumar, who drove JD(U) to snap 17-year-old ties with BJP in June 2013 in Bihar.
Former Speaker and JD(U) Vice President Uday Narayan Choudhary presided over the function at the party headquarters here.