US Secretary of State Condoleezza Rice reiterated the strong message sent by President George W Bush that the peacekeepers replace an under-funded African Union.
"The violence in Darfur must end, and it must end now," she told a meeting of 27 nations plus the European Union and the UN.
The UN Security Council has already adopted a resolution demanding the deployment of some 20,000 peacekeepers to replace an the African force, which has failed to halt the violence in Darfur.
But the government of Sudanese President Omar al-Beshir again refused to authorise the UN deployment and, according to Rice, government forces have recently launched a new offensive against rebels in Darfur.
"The violence in Darfur is not subsiding, it is getting worse," said Ms Rice.
The US government and human rights groups call the escalating violence in the western Darfur region genocide.
Ms Rice also reiterated comments by President George W. Bush earlier this week that the UN must find a way to act without Sudan’s consent if the peacekeeping force isn’t approved soon.