Singh has also invited senior Congress leaders from the state, including party MLAs, district presidents and former Ministers at his Patiala residence on Sunday seeking to show his strength and to strategise the party's revival in Punjab.
According to sources, Singh met Sonia at her residence and is understood to have told her that Bajwa, his known detractor, has failed to take the party along with him leading to major dissidence against his leadership.
He later said "Bajwa cannot secure victory for the party...It is time Pratap Bajwa is changed if Congress is to be rejuvinated in Punjab."
Singh has been openly airing his views against the leadership of Bajwa, who has been his known detractor, and seeking a change in the leadership in Punjab.
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Singh is understood to have told Sonia that if Congress has any chance left in Punjab, the party has to change Bajwa, who he alleges has failed to take the party with him and bring in fresh blood and vigour into the party.
Sources said Singh had also met Congress Vice President Rahul Gandhi before going abroad and raised the issue of leadership change with him.
The former Chief Minister said he has been seeking a change of guard in the Congress leadership in Punjab for over a year and a half now to prevent the party from splitting, especially at a time when BJP-Akali Dal equation seems to be changing.