Jha called Swamy a 'CIA agent' after a Wikileaks expose which claimed that the Bharatiya Janata Party leader had informed a US department officer about Indira Gandhi's failing health in 1977.
On Twitter, Swamy wrote, "My legal eagles Supriya Manan, Ishkaran Bhandari and my wife Dr. Roxna Swamy inform me that Sanjay Jha has sent an email letter."
My legal eagles Supriya Manan, Ishkaran Bhandari and my wife Dr. Roxna Swamy inform me that Sanjay Jha has sent an email letter. Contd.— Subramanian Swamy (@Swamy39) June 16, 2014
In the apology, Jha said that the tweet by him was "nothing more than a spontaneous enquiry" on the despatch authored by a US Department of State diplomat, which was leaked out in Wikileaks.
"Therefore solely to invite discussions in social media to seek perspectives and in good faith, the undersigned had submitted an opinion based this published Wikileaks item. Hence it was never the intention of the undersigned to malign Dr Swamy, to sully his reputation at all or to defame him," Jha said in the statement.
"I, therefore, regret any disrepute or pain caused to Dr Swamy, since that was never my intention and especially so as I hold Dr Swamy in high esteem," he said in the statement.