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Divisions among Democrats take center stage as the Senate debates two Iraq amendments to the defense bill. One, from Sen. John Kerry (D-MA), calls for a withdrawal of U.S. forces from Iraq by a certain date. A competing amendment, also from the Democrats, is an open-ended call for the withdrawal of troops. Republicans stand largely united against the amendments.

President Bush addresses the diplomatic challenge of North Korea's missile tests at a press conference in Chicago, where he vowed to work with allies to pressure the Stalinist nation to abandon its aggressive nuclear weapons program. Don Gonyea talks with Alex Chadwick about the president's remarks.

President Biden is on his first trip to Asia since taking office. In South Korea and Japan, he'll try to coordinate more closely with them on priorities including strategic competition with China.

Humanitarian groups are finding cheaper ways -- namely, filtering systems -- to clean up contaminated drinking water in developing nations. That could greatly reduce diseases caused by bacteria, viruses and parasites among the billion people worldwide who drink unsafe water.

The Senate continues to debate the contentious nomination of John Bolton as U.S. envoy to the United Nations. Democrats allege Bolton may have mishandled classified information and are trying to delay a vote.

About 1,000 people have been evacuated from a town in Southern California after a landslide Wednesday. Multimillion-dollar houses in Laguna Beach were destroyed as residents escaped. Meanwhile, construction continues on new and glamorous homes in the area. Member station KPCC's Rob Schmitz reports.

Scientists have developed vaccines that protect against the deadly Ebola and Marburg viruses. They hope to test the vaccines -- successful in experiments with monkeys -- on humans in two to three years. The viruses are at the top of experts' list of bioterrorism threats.

A rare mushroom that grows in the old-growth forests of the Pacific Northwest may offer protection from smallpox -- an infectious disease that security experts feel may be a biological weapon of choice for terrorists who wish to attack America.

Business and labor groups are weighing in on proposed immigration legislation. The Chamber of Commerce and the AFL-CIO are both against certain provisions in the bill. But agri-business interests are backing the proposals.

One brigade slated for deployment to Iraq this summer will instead be staying in Germany, courtesy of the Pentagon's reassessment of troop levels. Will political progress in Baghdad allow the Defense Department to lower U.S. force levels in the weeks ahead?