U.S. intelligence agencies have repeatedly warned top government officials that Iraq's Shi'ite Prime Minister Nuri al Maliki and his policies were gravely antagonizing his country's Sunni population, two U.S. security officials said on Friday. The officials said the warnings were contained in secret intelligence reports and analyses presented in the last two years to policymaking officials, including President Barack Obama. This contrasted with public comments by the Director of National Intelligence, James Clapper, who in his annual presentation to Congress on "worldwide threats" in January made only bland references to religious tensions in Iraq.