Delhi Chief Minister Arvind Kejriwal hailed Sidhu's resignation from the Upper House, saying it requires courage to give up a Rajya Sabha membership to "save" his state.
Top AAP sources said the 52-year-old politician will join the party in a few days' time. There was speculation that Sidhu may be in the race for AAP's chief ministerial candidate in the state.
AAP's senior leader and party's Punjab affairs in-charge, Sanjay Singh said "Navjot Singh Sidhu has taken a brave step by resigning from membership of Rajya Sabha and I welcome his decision. The official announcement will be done at the right time.
"In the war between the dharma and adharma, he will come along. It's a good sign that righteous forces are coming together," he said, adding that Sidhu and his wife have been consistently raising voice against the drug mafia, about the plight of farmers and other issues concerning the welfare of the people.
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Sidhu's wife, who is a BJP MLA from Amritsar (Rural) is also expected to follow suit.
However, the party is still tight-lipped over declaring him as its chief ministerial face.
The buzz of Sidhu joining the AAP was on after the party
won four Lok Sabha seats from Punjab. He was also reportedly upset over the party denying ticket to him from Amritsar. The party, however, tried to pacify him by sending him to Rajya Sabha.
AAP's Punjab convenor Sucha Singh Chhotepur hailed Sidhu's decision and said the party was "looking forward" to welcome him.
"Navjot Singh Sidhu is most welcomed to join @AamAadmiParty @sherryontopp @AAPPunjab2017. Appreciate Navjot Sidhu and Dr Navjot Kaur Sidhu Move, looking forward for their Welcome to @AAPPunjab2017 @AamAadmiParty @DrDrnavjotsidhu (sic)," he tweeted.
Asked if Sidhu could be made AAP's CM candidate in case he decides to take the plunge, AAP's Sangrur MP Bhagwant Mann said, "Whoever joins AAP, he is clearly told that it has to be unconditional."