"There is no question of an alliance with UPA as our political understanding is to provide a platform to the people of the country which is alternative to basic policies of both Congress and BJP," CPI (M) polit bureau member Brinda Karat told reporters here.
She also demanded an impartial probe in Rs 52,000 crore loan wavier scheme of the UPA, which came under the CAG scanner, alleging that farmers were not getting loans under it and were in huge debt.
Both the Congress and the BJP have "utterly failed" to address the challenges and basic issues before the country, she said.
Karat alleged that UPA was "subverting" all democratic institutions of the country due to pro-corporate governance.
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The current budget showed a deficit of Rs 5.2 lakh crore, but Rs 5.73 lakh crore tax concessions were given in the budget proposals, she claimed.
"There is a competition between the Congress and the BJP as to who will look better to corporate sector," she said. "BJP's Gujarat model is a corporate model of unequal growth which is not acceptable," Karat said.