The Congress must keep its Maharashtra unit chief Nana Patole "under observation" and his "physical and mental health" must be checked for his comment against Prime Minister Narendra Modi, state BJP chief Chandrakant Patil said on Monday.

Patole was heard saying in a recent video that he would badmouth and beat "Modi", though he clarified later that he was talking about a goon from Bhandara and not the prime minister.