The counsel for former ambassador Hussain Haqqani has written a letter to ex-PM Imran Khan for shunning smearing.
The PTI chief has made several statements against Haqqani, accusing him of being part of a US-backed conspiracy to oust him from the PMO in April last year.
According to the media reports, Haqqani's counsel said that a defamation case will be initiated against the former premier if he continues the tirade against him.
The former diplomat's American attorney Steven Barentzen sent the letter to Khan at his Bani Gala address which was delivered on Monday.
Imran Khan accused Haqqani was hired by the former military chief General (retd) Qamar Javed Bajwa and the military intelligence to lobby for the Pakistan military in the US and that the ex-ambassador created a negative image of him in the US.
Haqqani denied all these allegations stating that the PTI chairman hallucinates and lies. Barentzen asked the former premier to immediately cease and desist from making false and defamatory statements about Haqqani, specifically falsely accusing Haqqani of providing lobbying services to ex-COAS Qamar Javed Bajwa in the US and launching a campaign against Imran or taking any other actions to incite or cause Imran's followers to harass Haqqani or cause him violence.