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Speaking about easing restrictions on higher-ethanol gasoline amid spiking fuel costs, Biden said prices shouldn't "hinge on whether a dictator declares war and commits genocide a half a world away."

Responsibility is difficult to prove conclusively in a war zone, and evidence might have to link such acts to national leaders far from the battlefield. But it has happened.

A suicide car bomber struck a U.S. intelligence safe house in the northern Iraqi city of Irbil Tuesday, killing at least three people and wounding about 50 others, including several Americans. Until now, the Kurdish-controlled city had been largely peaceful. Hear NPR's Emily Harris.

Increasingly sophisticated attacks by Iraqi insurgents cause relief agencies and private contractors to reassess their operations in the country. The International Red Cross, a target of Monday’s attacks, is considering reducing its staff. The United Nations has already reduced its presence, after being struck in an earlier bombing. NPR's Michele Kelemen reports.

Ukraine's military has fought so effectively that Russia abandoned its initial plan, which envisioned a quick takeover of Kyiv. Now Russia has a new approach, which focuses on eastern Ukraine.

Though more Republican-held seats are up for grabs in November, Democratic struggles mean the GOP has improved its likelihood to take control of the Senate. Here are the key contests to watch.

California Gov. Arnold Schwarzenegger endorses measures to reduce greenhouse gas emissions statewide. California's air quality goals have implications for industry and auto makers because they often lead to a ripple effect for laws across the country.

President Bush meets with Mexican President Vicente Fox and new Canadian Prime Minister Stephen Harper in Cancun, Mexico, for talks. Immigration and border security -- and the balance between the two -- are expected to dominate the two days of meetings.

Enron whistleblower Sherron Watkins testifies against former chairman Kenneth Lay. Watkins met with Lay four months before the company went bankrupt, and warned him about accounting problems. Prosecutors hope her testimony will show that Lay made intentionally misleading statements to investors.

The Department of Homeland Security is increasing its presence along the U.S.-Mexican border. But qualifications for border patrol agents are tough, and recruiters struggle to meet their quotas. Those who do complete training at the U.S. Border Patrol Academy in New Mexico often leave for greener pastures. Carrie Kahn reports.