New Delhi: Delhi's ruling Aam Aadmi Party, which has chastised the Congress for refusing to support its agitation for control over bureaucrats, wants to support a "third front" candidate in the election for Rajya Sabha deputy Chairperson.

"We will support a third front candidate. If the Trinamul Congress fields Derek O'Brien, we will support him," a party senior told The Telegraph.

"The regional parties are angry with the Congress because of its attitude in Delhi, which is working in the BJP's favour, and don't want to vote for a Congress candidate in the Rajya Sabha."

He added: "Talks are on to decide a candidate. Derek O'Brien's name has come up, and we'll support him because of the unwavering stand that Trinamul has taken to defend the powers of the states against the BJP-ruled Centre."

However, the Left, which supported the AAP agitation, is unlikely to vote for a Trinamul candidate.

On Tuesday, the Aam Aadmi Party ended its eight-day sit-in at Raj Niwas, the office and residence of lieutenant governor Anil Baijal, during which it had a public spat with the Congress.

The AAP has three members in the Rajya Sabha, where deputy Chairperson P.J. Kurien's term ends next month and a united Opposition has a chance to win the post. The CPI has a single member and the CPM five in the Upper House.

CPI general secretary S. Sudhakar Reddy met Delhi deputy chief minister Manish Sisodia, who returned to work on Tuesday after a five-day hunger strike inside Raj Niwas.

"We did not discuss the Rajya Sabha election and only talked about the agitation by (chief minister Arvind) Kejriwal, which we support," Reddy told this newspaper.

"The CPI has not discussed or decided whom to elect as Rajya Sabha deputy Chairman. It will be difficult for us to support a Trinamul candidate because of their anti-democratic actions in Bengal."

Kejriwal, who is also his party's national convener, had begun the sit-in on June 11 along with three of his ministers, demanding action against an alleged strike by IAS officers and approval for a ration scheme.

On Saturday, the chief ministers of Bengal, Andhra Pradesh, Karnataka and Kerala, who were in Delhi for a Niti Aayog meeting, visited Kejriwal's home in a show of support after being denied permission to meet him inside Raj Niwas.

Except for the Bahujan Samaj Party and the Congress, most Opposition parties and even BJP ally Shiv Sena supported Kejriwal's agitation as a step necessary to protect the federal system.