KUALA LUMPUR, July 26 — Finance Minister Lim Guan Eng called today for an investigation into a government letter to the US intelligence agency that purportedly sought support for Datuk Seri Najib Razak just days before the May 9 general election.

Lim, who is also Bagan MP, said there were many questions surrounding the issuance of such a letter as it concerned Malaysia’s sovereignty.

"Was this letter sent to other countries? Are there any more letters?” Lim told reporters in the Parliament lobby here.

The letter to the US Central Intelligence Agency (CIA) was supposedly written by a senior government official in the Prime Minister’s Department during the Najib administration.

"This invites foreign powers to intervene in the country’s affairs,” he said.

"Who ordered it? Can an officer issue a letter like that?” he added.

He said that there should be a "comprehensive and extensive” investigation into the matter.