The United Nations says its Secretary-General Kofi Annan is not to quit despite US charges of his involvement into possible fraud in the oil-for-food program.

The US State Department on Wednesday endorsed a Senate investigation to Iraq's Saddam regime of raising more than 21 billion dollars by subverting UN sanctions, and several senators believe Kofi Annan should be held accountable for U.N.'s failure to detect the abuses.

But Annan's spokesman Fred Eckhard says the Secretary-General has no plan to resign, saying he is intent on continuing his substantive work for the remaining two years and one month of his term.