"The time has come to change the party in the Centre and this will happen very soon," he said, addressing a protest rally at the Ramlila ground here.
"The parties opposing the present government should forget their differences and come together for maintaining the unity and secular identity of the country. We need to draw the collective benefit of the unity shown (here)," he said.
The former Prime Minister along with UPA Chairperson Sonia Gandhi joined the protest march that started from Rajghat and culminated at Ramlila ground.
The march as part of a nationwide protest, or "Bharat Bandh", was led by Congress President Rahul Gandhi and other opposition leaders.
The former Prime Minister appreciated the presence of around 20 political opposition parties joining the Congress in the protest against the government.
He said it was a significant moment ahead of the general elections next year and "we should take advantage of this (unity) and bring about a movement" in the country.
The protest was called by the Congress and Left parties against the spiralling cost of petrol and diesel which have reached record levels.
The protest was supported by several opposition parties including the Janata Dal-Secular, Trinamool Congress, Rashtriya Janata Dal, Nationalist Congress Party, Loktantrik Janata Dal, Rashtriya Lok Dal, All India United Democratic Front, Revolutionary Socialist Party and Aam Aadmi Party among others.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)