Hyderabad, (Agencies): Congress MP from Rajahmundry, Vundavalli Arunkumar, on Saturday shot off a letter to former party leader Y S Jagan Mohan Reddy challenging him to prove the "authenticity" of a email purportedly sent by late Andhra Pradesh Chief Minister Y S Rajasekhara Reddy suggesting merger between Congress and Praja Rajyam Party.

Arunkumar, a confidante of KVP Ramachandra Rao, Rajya Sabha MP and whom late Rajasekhara Reddy had once described as his soul-mate, refuted Jagan camp's charge that the mail was engineered and maintained it was genuine.

Arunkumar invited Jagan to verify the mail either on his or the former MP's computer.

This was the second salvo Arunkumar fired at Jagan, widening the rift between KVP and Jagan.

The differences between K.V.P. Ramachandra Rao and Jagan had come to the fore when the latter refused to heed to the advice of the Congress high command to call off his controversial "Odarpu Yatra" and now the two groups are fighting for the legacy of YSR.

Three days ago, Arunkumar had released a two para extract which he claimed to be a part of YSR's email sent to AICC president Sonia Gandhi, immediately after 2009 elections inviting PRP chief Chiranjeevi for a merger with Congress.

Leaders of Jagan's camp immediately mounted a verbal attack on Arunkumar though the latter had disclosed the same in response to senior Congress leader G.Venkataswamy's tirade against Sonia Gandhi.

In response to the charge that he had engineered the email, Vundavalli today wrote an open letter to Jagan, challenging him to a meeting to verify the truth.

He also denied that his act was a betrayal of friendship with YSR.

The Jagan camp's charge betrayal was apparently pointed at K.V.P.Ramachandra Rao as it knows that without the knowledge of KVP, Arunkumar would not release the letter.