He was cheered by flag-waving supporters at an annual three-day convention in Bindura, 60 miles northeast of Harare, the capital.
Mugabe, 84, has ruled the country since its 1980 independence from Britain and refused to leave office following disputed elections in March.
He has faced renewed criticism amid a humanitarian crisis that has pushed thousands of Zimbabweans to the point of starvation and left 1,123 people dead from cholera since August.
President Bush, Prime Minister Gordon Brown of Britain, and President Nicolas Sarkozy of France are among those who have called for Mugabe to step down.
In Washington, State Department spokesman Sean McCormack said yesterday that the "last time the world checked, Zimbabwe belonged to the people of Zimbabwe."
"You know, again, it's a statement that I think sums up in a concise way what is at the root of Zimbabwe's problems," he said.
On Thursday, the US assistant secretary of state for African affairs said questions about how much longer Zimbabwe can withstand hunger, disease, and political stalemate before disintegrating ignore that "there is a complete collapse right now."
"We think that the person who has ruined the country . . . that he needs to step down," Jendayi Frazer said.
Mugabe yesterday called Frazer a "little girl" and questioned which African countries "would have the courage" to order a military intervention. Most neighboring countries, including regional giant South Africa, are opposed to such an intervention.
"What the Americans want just now, is the removal of President Mugabe. But President Mugabe has been elected by his people and we have told them as we have told the Europeans that the only persons with the power to remove Robert Gabriel Mugabe are the people of Zimbabwe," he said.
Critics blame Mugabe's policies for the ruin of the once-productive nation. Mugabe blames Western sanctions for the economic meltdown, though the European Union and US sanctions are targeted only at Mugabe and dozens of his clique with frozen bank accounts and travel bans.
Mugabe repeated charges that the European Union, former colonizer Britain, and the United States were exaggerating the cholera epidemic to urge regime change.
Mugabe lost March presidential elections to opposition leader Morgan Tsvangirai, whose party also ended the 28-year domination of Parliament by Mugabe's party. But official results said Tsvangirai did not win outright. He withdrew from a runoff because of state-sponsored violence against his supporters.
Yesterday, Mugabe harangued his party leaders and supporters over his loss, accusing some of them of supporting the opposition. Mugabe and Tsvangirai agreed in September to form a unity government but have been deadlocked since over how to share Cabinet posts.
