"Modiji I'm ready to debate the issue of reservation with you anyday. Stop misleading people & your efforts to add communal colour to BiharPolls," Kumar tweeted.
Party general secretary K C Tyagi in Delhi said, "Chief Minister Kumar is ready to debate with Modi on it in Delhi, Patna or Ahmedabad, on the issue."
Rejecting the Prime Minister's charge that 'Mahagathbandhan' leaders are trying to "steal" 5 per cent from quota to give it to a particular community, he said "no leader of the 'grand alliance' has sought reservation in the name of religion.
In an election rally in Gopalganj, Modi had referred to a discussion in Parliament on August 24, 2005 when Nitish Kumar had favoured a five per cent quota on religious lines and dared the Bihar chief minister to reply to his assertion.
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Modi has been attacking Lalu over issues pertaining to the former Bihar chief minister's regime.
Launching a counter attack, Lalu on Twitter said, "Modi is the convener of scams. He doesn't have moral fiber to prevent, condemn and censure his own govt & party's scams."
"Modi & his team is digitally illiterate & still talk abt Digital India.The Skill Development Minister needs to develop his own skills first," he further tweeted.