The United States and Britain are proposing that the United Nations set a seven-day deadline for Iraqi President Saddam Hussein to agree to disarm and open his palaces for searches of hidden weapons, a Bush administration official and U.N. diplomats said Friday. President Bush backed a U.N. effort, saying, "I'm willing to give peace a chance." The tough demands are coupled with a warning that "all necessary means" would be used against Iraq in the event of defiance, the officials told The Associated Press on condition of anonymity. Describing the proposed U.N. resolution as tough and detailed, the U.S. official...