Cabinet since the March presidential election , during which no candidate won enough votes to avoid a runoff , according to the government . After opposition leader Morgan Tsvangirai withdrew from a June runoff , saying Mugabe 's supporters had waged a campaign of violence against opposition supporters , Tsvangirai and Mugabe reached a power-sharing agreement that has yet to be implemented . The political impasse has aggravated the country 's humanitarian and economic crisis , including a cholera outbreak that began in August . Frazer said that during her trip , she consulted with the leaders of Zimbabwe 's neighbors who are stuck between their concerns about Mugabe 's grip on power and their support of the power-sharing agreement , which they still think is the best way to deal with the crisis without creating a backlash . Frazer said she believes it could be weeks before African leaders put pressure on Mugabe to step down , which she said could be achieved by simply telling him with one voice that he should go . She said the U.N. Security Council will deal with the issue of Zimbabwe next month . This time , she said , South Africa
PRETORIA , South Africa -LRB- CNN -RRB- -- The United States no longer supports a power-sharing deal between Zimbabwe 's President Robert Mugabe and the country 's main opposition because a viable unity government is not possible with Mugabe in power , a top U.S. diplomat said Sunday . Zimbabwe President Robert Mugabe , in a speech to supporters Saturday , refused calls to step down . The statement from U.S. Assistant Secretary of State for African Affairs Jendayi Frazer follows recent calls from President Bush and other world leaders for Mugabe to abandon power amid a growing cholera epidemic that the United Nations says has killed more than 1,000 people in recent months . Frazer visited southern Africa to articulate the change in U.S. policy toward Mugabe at the request of U.S. Secretary of State Condoleezza Rice . She made the comments Sunday during a roundtable discussion with journalists in Pretoria , South Africa , before her expected return to the United States later in the day . She called for a new vote in Zimbabwe . `` Fresh elections are necessary but not possible under the current environment , '' Frazer told reporters . Zimbabwe has had no