"The biggest NPA trapeze artiste in PSUs is Gautam Adani. It is time he is made accountable or a PIL (public interest litigation) is inevitable," he said in a tweet.
"There are a number of things he is getting away with and nobody is questioning him. It may become an embarrassment for the government as he portrays himself as close to it," he claimed.
Swamy said the government should call for a status report on different cases involving his companies and listed NPAs, and controversies over coal import and his business in Australia among these matters.
"Capital intensive projects necessarily require debt capital," it said.
"Given our rating track record, different sources of debt are available to the Group, ranging from international bonds, ECB loans, domestic bonds, loans from private sector as well as public sector banks in India.
"The singular critical test for debt is its regular servicing-something which the Adani Group has implemented diligently, since its inception," it said.