Addressing a press Conference on Sunday, AAP leaders Ashutosh and Sanjay Singh seconded the Congress' claims about the letter calling it rubbish and forged.
The AAP leaders said the letter that has surreptitiously been circulating on the internet was a part of "conspiracy in which few people were trying to portray one leader as greater than the other.
They alleged earlier it was tried to glorify Sardar Patel as bigger than any other leader in the country.
The AAP leaders said that people "who have no association with country's freedom struggle are trying to belittle Nehru and Gandhi."
They also criticised the National Democratic Alliance government for declassifying secret files relating to Bose in parts.
The duo said that the government should declassify all the files together instead of making it part-wise such as 25 files every month.
On Saturday, Prime Minister Narendra Modi made public digital copies of 100 secret files relating to Bose on his 119th birth anniversary, which could throw some light on the controversy over his death.
The files were declassified and put on digital display at the National Archives of India.
The NAI also plans to release digital copies of 25 declassified files on Bose in the public domain every month.
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