Islamabad, Nov 21 (IANS): Pakistan's ambassador to the US Husain Haqqani has offered to hand over his BlackBerry phone to investigators to assist in the probe into a secret memo that claims President Asif Ali Zardari feared a military coup.

Haqqani met Zardari Sunday and spoke to him about the secret memo. He then expressed his willingness to hand over his BlackBerry for investigation, reported Geo News.

Pakistani businessman Mansoor Ijaz alleged last month that a senior Pakistani diplomat asked for help in getting a message from Zardari to then chairman of the US Joint Chiefs of Staff, Admiral Mike Mullen.

Ijaz alleged that Zardari feared a military takeover following the US raid that killed Osama bin Laden in Pakistan May 2.

The businessman says he has phone records of calls allegedly from Haqqani and his US contact between May 9 and 10.

Haqqani told Geo News that he was unable to understand the claims made by Mansoor Ijaz.

While raising several questions, he asked why Mansoor Ijaz had sent the memo and who delivered that to Mullen. He also wondered as to how it was proved that he had authored the memo.

Haqqani's wife and Member of National Assembly Farahnaz Isfahani Monday spoke of legal action.

Isfahani said she was ready to cooperate in the forensic probe of her husband's BlackBerry phone and computer.

Prior to the memo issue, the Pakistan Army and the Inter-Services Intelligence (ISI) were upset with Haqqani over issuance of visas to Americans without "prior scrutiny" by the Pakistani security agencies.

Before leaving Washington for Pakistan, Haqqani met US special representative to Pakistan and Afghanistan Marc Grossman.