WASHINGTON — In a new effort to engage the government of Sudan, U.S. officials say the White House will shift its policy toward Khartoum, but they warn that the violence and humanitarian abuses in Darfur must stop.

Secretary of State Hillary Rodham Clinton, the U.S. ambassador to the United Nations, Susan Rice, and the administration's special Sudan envoy, Scott Gration, are to unveil the policy Monday at a news conference at the State Department, the officials said.

The announcement is planned to show unity within the Obama administration. Rice and Gration have notoriously clashed over engaging with the Sudanese government of President Omar al-Bashir, who has been charged by the International Criminal Court with crimes against humanity and war crimes for allegedly masterminding deadly attacks throughout Darfur.