HARARE, Zimbabwe — Zimbabwe's prime minister says he won't renegotiate over a draft constitution despite demands by President Robert Mugabe for major amendments to the document.

Morgan Tsvangirai said Tuesday he was ready to reconsider "one or two issues" but Mugabe's party had completely rewritten the draft. Mugabe's ZANU-PF party, in a shaky coalition with the former opposition, "totally rejected" the draft agreed upon and signed by representatives from all parties, he said.

The deadlock could only be broken by regional leaders who brokered the coalition after disputed and violent elections in 2008, Tsvangirai told reporters.

Under the terms of the coalition, a referendum on a reformed constitution must be held before fresh elections. Mugabe's party wants sweeping powers it has held since independence in 1980 restored in the draft constitution.