"There is serious financial crisis in the country. For the first time, the corporate sector is openly levelling allegations that the country has become leaderless. It's condition is equal to that of a boat without a boatman," he said in a press release.
He also took jibe at Singh's statement that "we have to raise our economy through our own good steps".
"Prime Minister is realising today that we will have to find a solution to our problems ourselves. Even an uneducated person knows that one has to solve one's problems oneself. Anyway, our learned Prime Minister understood this finally though a bit late," Tiwari said.
He also disapproved arguments of economic reforms and tough decisions like doing away with subsidies to improve the economy and questioned its impact on farmers and the poor.
"Nobody is saying that the relief of lakhs of crores given to the corporate sector is withdrawn," he rued adding that "excess expenditure" in the government needs to be checked.
On Friday, Tiwari had said Mukherjee was not "responsible" for the mess in the Indian economy and that the crisis was a result of host of issues, including global economic situation.
On the BJP squarely holding the Union Finance minister responsible for the prevailing price rise and inflation, Tiwari had said the situation would have been no better even if BJP leader Ravishankar Prasad was Finance Minister.
