WASHINGTON (AFP) - US president-elect Barack Obama on Sunday vowed to take swift action on the Middle East peace process and Iran's nuclear ambitions but played for time to shut down the Guantanamo Bay prison camp.

In an interview with ABC's This Week program broadcast Sunday, Obama defended his reluctance to speak out on Israel's bloody offensive in the Gaza Strip before he succeeds President George W. Bush on January 20.

But while he promised rapid efforts on the peace process and diplomatic engagement with Iran, Obama said it would be a "challenge" to close the Guantanamo Bay prison camp in his first 100 days in office.

Obama said he was building a diplomatic team so that "on day one, we have the best possible people who are going to be immediately engaged in the Middle East peace process as a whole."

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This video is from ABC's This Week, broadcast Jan. 11, 2009.

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