Chief Minister Arvind Kejriwal's trusted lieutenant and party leader Sanjay Singh, chartered accountant N D Gupta and educationist Sushil Gupta received a 'Certificate of Election' from the returning officer for the Rajya Sabha polls.
Earlier in the day, election authorities rejected a petition of Delhi Congress chief Ajay Maken seeking the cancellation of N D Gupta's nomination, for allegedly holding an office of profit.
AAP's national secretary Pankaj Gupta called it a "historic day" for the party which recorded a spectacular victory by bagging 67 seats in the 70-member Delhi Legislative Assembly in 2015.
"My job will be to raise issues related to Delhi and highlight how the Centre is not allowing an elected government to work despite its massive mandate," Singh told reporters at the party office where he, along with the other two new MPs, were felicitated by Pankaj Gupta and Delhi unit convenor Gopal Rai.
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Singh, who is one of AAP's founder members and a part of its top decision-making body, the Political Affairs Committee, also said raising the issue of statehood for Delhi would be his top priority in the upper house.
Vishwas had also made his displeasure known after the party's decision.
Singh, Rai and Pankaj Gupta did not take any questions on Vishwas at the press conference today.
Although the party's strength in Parliament now goes up to seven, it is still fragmented. Of the four MPs in the Lok Sabha, two--Dharamvira Gandhi and H S Khalsa--have been suspended.
The other two--Bhagwant Mann and Sadhu Singh -- had clocked 55 per cent and 53 per cent attendance respectively in Parliament, according to PRS Legislative, a fact tank.