BERLIN — Germany’s chancellor will raise the issue of NSA’s eavesdropping on European communications when she meets President Barack Obama here next week — the latest sign of the international backlash over America’s sweeping electronic surveillance programs.

Obama has defended the once-secret programs that sweep up to an estimated 3 billion phone calls a day and amass Internet data from U.S. providers, saying they are a necessary defense against terrorism. He assured Americans on Friday that “nobody is listening to your telephone calls.”

That has given little assurance to Germans and other foreigners, who routinely use U.S.-based Internet sites for voice and data communications. European nations often have much stricter privacy laws than those in the U.S., and their citizens defend those privacy rights with more vigor.