New Delhi: Prime Minister Narendra Modi today greeted Congress president Sonia Gandhi on her 70th birthday.“Birthday wishes to Smt Sonia Gandhiji.May Almighty bless her with a long life filled with good health,” Mr Modi tweeted.Congress leader Jyotiraditya Scindia also greeted Ms Gandhi on the occasion.Warm birthday greetings to Smt Sonia Gandhiji on her 70th birthday.