Bidding farewell to members retiring from the Rajya Sabha, Prime Minister Narendra Modi on Thursday lauded the contribution of his predecessor Manmohan Singh to the House. Manmohan Singh came to vote in the Rajya Sabha on a wheelchair to help strengthen democracy, PM Modi said. In a sarcastic jibe at the Congress, he thanked Leader of Opposition Mallikarjun Kharge for coming out with a "black paper" against his government and referred to it as "kaala teeka" (to ward off the evil eye) in the midst of good work being done by his government.