Former prime minister Manmohan Singh today said the credibility of institutions like Parliament and CBI has been systematically denigrated in the Narendra Modi-led regime, which he said is making a "careful, well-thought-out calibrated effort" to weaken democracy. Addressing a press conference ahead of the November 28 Madhya Pradesh Assembly polls, Dr Singh said corruption was peaking in the Modi government. "The country has witnessed credibility of institutions like Parliament and CBI systematically denigrated. There is a careful, well-thought-out and calibrated effort to weaken democracy," he said.