Mr Vadra is the son-in-law of Congress president Sonia Gandhi, often described as the most powerful person in the country.
Last year, Nutan Thakur had filed a Public Interest Litigation or PIL in Uttar Pradesh asking that Dr Manmohan Singh's office order an investigation into whether Mr Vadra was given sweetheart land deals by real estate major DLF in the state of Haryana, where the Congress is in power.
Ms Thakur's appeal was rejected by an Allahabad court after the Prime Minister's Office (PMO) said it could not order a probe in business dealings between two private entities. The PMO's response was listed in an affidavit to court.
Ms Thakur then filed a Right to Information application, asking for details of documents and notings that were used to prepare the PMO's affidavit. She also asked for details of what action did the PMO take - whether it involved other ministries, for example - after she filed her petition in court seeking an investigation against Mr Vadra.
In its response to her, the PMO has said that while the Right to Information Act aims at creating transparency to contain corruption and increase accountability, it also seeks to "ensure that revelation of information, in actual practice, does not harm or adversely affect other important public interests which include efficient functioning of the governments, optimum use of limited fiscal resources, and preservation of confidentiality of sensitive information."
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