"I do not think we should have done it at all... We ruled for 15 years for good, bad or ugly. People have rejected us. We should accept the verdict in all humility," he said, adding that it was time for Congress to introspect. (Agencies)
Tewari, however, stressed that it was his personal opinion and he was not speaking for the party.
Speaking at a debate, he said it was really between BJP and AAP, who have emerged as the two largest parties in Delhi, to find ways to form a government.
He also said time might have come for election funding reforms to account for every rupee political parties receive.
"We (parties) comply with the law as it stands today. Yes if there is a deficiency in law, there is a need that it possibly does not inspire confidence because of its opaqueness, let’s go ahead and change the law," he said.
Senior advocate and APP leader Prashant Bhushan accused big national parties of maintaining secrecy about their funding.
He claimed big parties take illegal donations from private firms and then reward them with contracts in states ruled by them.
BJP treasurer Piyush Goyal said right from the candidate fighting the election to hundreds of local units collect money and an auditing is done.
Both Tewari and Goyal said there was no simplistic solution to this complex issue of campaign finance.
Present laws allow parties to not account for donations up to Rs 20,000 and critics say they exploit this provision to pass off large sums of money collected from private companies and others as unaccounted by dividing them into many donations under the limit.
"I do not think we should have done it at all... We ruled for 15 years for good, bad or ugly. People have rejected us. We should accept the verdict in all humility," he said, adding that it was time for Congress to introspect.