Gates arrives in Iraq after Israel, Jordan visits.

Summary: United States Defense Secretary Robert Gates arrived in Iraq on Tuesday in an unannounced visit to discuss security issues and arms sales as the two nations look toward the gradual withdrawal of all

United States Defense Secretary Robert Gates arrived in Iraq on Tuesday in an unannounced visit to discuss security issues and arms sales as the two nations look toward the gradual withdrawal of all U.S. forces by the end of 2011.

Gates also will try to help bridge a deep divide between Iraq's ethnic Kurds and majority Arabs that many fear may undermine security gains, a senior U.S. defense official said.

"We're saying to all the parties involved …