A media report has claimed that high power listening devices were found in the bed room at the 13 Teen Murti Lane residence here of Gadkari, the Road Transport and Highways Minister.
It said the discovery was "accidental" and a debugging exercise was immediately ordered.
"Reports in a section of the media about listening devices having been found at my New Delhi residence are highly speculative," Gadkari said on his Twitter account.
Giving a different version, senior BJP leader Subramanian Swamy said since Gadkari has been a very important leader and had the confidence of RSS, he might have been targeted by the UPA regime.
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Congress spokesperson Randeep Singh Surjewala said, "If reports of bugging of senior Cabinet minister Nitin Gadkari, who is also a former BJP president, are correct, they are indeed extremely serious."
"It reflects a certain lack of faith amongst ministerial colleagues and an absence of mutual trust. It's time that both Gadkari and also BJP and government come clean on the issue and place before the people of the country if at all there was bugging and if there was snooping being done...
Swamy said, "My own investigations and my sources reveal that this may happen not later than October last year. The planting of the device and that means at that time, when the UPA was in power, the NSA has specifically targeted the BJP and Gadkari was a very important person. He had the confidence of the RSS."