"I did not take the name of a leader, then why daze? .......Decide the BJP's friends or enemies," Modi said in his latest tweet.
Though Sinha did not immediately return the fire, his fans took up the cudgel, expressing anger at Modi's stinging characterization of their icon "gaddar" (traitor) and sought ouster of the former Bihar deputy chief minister.
Hundreds of members of the "Shatrughan Sinha Fans Association" held a meeting here and slammed 'objectionable' comments by Modi, saying that by levelling "wayward allegations" everyday, Sushil Modi is turning the party into a "laughing stock."
They asked BJP national president Amit Shah and its state chief Nityanand Rai to sack Modi from all important posts.
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The two leaders took to Twitter to attack each other since Monday, exchanging barbs. It all started when Sinha in a tweet berated Sushil Modi for indulging in "negative politics".
"Enough of negative politics and mudslinging by opponents on our political leaders, be it Kejriwal, Laloo Yadav or Sushil Modi," Sinha said in a tweet, drawing stinging reaction from Modi who sought removal of "gaddars" (traitors) from the House.