The Congress General Secretary also said that party President Sonia Gandhi has really never interfered in the functioning of Manmohan Singh Government.
"Personally, I feel that this model hasn't worked very well. Because, I personally feel that there should not be two power centres and I think whoever is the Prime Minister must have the authority to function although Sonia Gandhi has really never interfered in the functioning of the government," Singh told News X TV Channel.
Reacting to another question whether Manmohan Singh looked like he did not have authority, the Congress leader said, "He has the authority. ...If you see the nuclear deal and other areas also I think, he has been quite forthright."
"I feel that Sonia Gandhi is the last person to intervene ...Interfere in governance. Of course, she has led the party from a period when the party itself was helpless. We hardly had two chief ministers at that time to a situation where we have formed Government in Delhi in 2004 and 2009.
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"Even if a Congress-led coalition emerges, he (Rahul) is mature enough to handle the intricacies of coalition politics. Then of course, we have senior leaders who have very successfully helped the UPA to complete two terms.
Of course, Sonia Gandhi will always be there to help out," he added.
Asked what would be the Sonia Gandhi's role in a scenario when Rahul takes more and more active role, Singh said, " she would continue to be the AICC president".