Sources close to the president told the BBC, the letter was sent to the PM on a Sri Lanka Freedom Party letter head. The president had written to PM as the Chairperson of the party addressing him as the senior vice president.

In the letter sent on Thursday, President Chandrika Kumaratunga said the premier "unilaterally decided to reject the tsunami aid-sharing structure," which had been "approved by our party, the Cabinet , and presented to Parliament by you."

The President expresses her dismay over the change of his mind within a "couple of months".

breaching discipline

The president accuses the Prime Minister of breaching Party discipline. "I inform you that your actions totally breach party discipline by your unilateral action."

She accused him of not informing her or the party's central committee about signing the agreement and not keeping an earlier promise to amend sections of the agreement.

"While you sent invitations to others, and telephoned them to invite for the signing. You deliberately avoided informing me." says the President in her letter.

"Our party has long held that peace can be achieved only by devolving power within a united country," Kumaratunga said.

"Your agreement talks about devolving power within a unitary state, which is impossible. It has never been done anywhere else in the world."

piece of cake

Referring to a comment by the Prime Minister that he was willing to meet the LTTE leader, The President says, "You will only be able to have a piece of cake with him".

"Please inform me and the people of this country, how you plan to do anything for peace under this agreement" she said.

When the BBC Sandeshaya approached the Prime Minister Mahinda Rajapakse for a response, he said, "I have not received any such letter from the President. So, I am unable to comment."