Coal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime MinisterCoal scam: Ashwani Kumar need not resign, says Prime Minister