President Obama and Secretary of State John Kerry are moving to quell international anger over reports of widespread U.S. surveillance abroad.


German Chancellor Angela Merkel checks her mobile phone during a session of the Bundestag in Berlin ( Sean Gallup/Getty Images)

Longer term, foreign policy experts say National Security Agency tactics threaten to undermine America's ability to influence world affairs in a host of areas such as a free trade agreement being discussed with Europe.

Most governments caught up in the NSA surveillance have not retaliated, but some countries are pushing back against alleged tactics that include tapping up to 35 world leaders' cellphones.

Germany and France are demanding that the Obama administration agree by year's end to new rules that could mean an end to reported American eavesdropping on foreign leaders, companies and innocent citizens.

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