The party also sought to drag East Delhi BJP MP Maheish Girri into the matter and alleged that even he has written a letter to the LG in favour of owner of 'Hotel Connaught', who was arrested on the charges of murdering Khan.
However, the party did not elaborate further on details of letter by Girri.
Addressing a news conference, AAP's Delhi unit convenor Dilip Pandey said the Cantonment Board in its meeting on May 13 had made very "stinging remarks" against Tanwar.
Khan was shot dead on May 16, a day before he was scheduled to pass the final order on the lease terms of hotel 'The Connaught' which was functioning on a property leased by the civic body.
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Police last week arrested the owner of hotel, Ramesh Kakkar, and five others in connection with the murder.
Pandey said the a decision was also taken to initiate "stern legal action" for defaming the Board and for his derogatory allegations.
"It (the meeting by the board) has also asked the authorities to initiate all legal action against him as per relevant provisions of the Cantonments Act, 2006 and other applicable civil and criminal law,"
"He may also may also be allowed to the meet the CEO in his office with prior appointment only and he shall be accompanied by one person only in his meeting with the CEO," Pandey said, further reading out the order," Pandey said.