"It's not unusual now, when there's a tense part of the world where there's conflict happening, for hackers to take matters into their own hands and to take potshots like this, " he said.

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U.S.-Pakistani relations remain tense, in part because of U.S. drone strikes inside the country.

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As the relationship between the United States and China grows ever more tense, in part due to the complex web of competitive and collaborative situations that the two large economies increasingly find themselves in, the potential for misunderstanding grows.

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In two debates now, Bush has appeared tense and uptight -- and his answers have been, for the most part, memorized stock lines from his standard stump speech.

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