German outrage over a secret U.S. Internet spying program is building before a visit by Barack Obama next week, with senior members of Chancellor Angela Merkel's government demanding a full explanation from the president when he lands in Berlin. Merkel's spokesman has said she will raise the issue with Obama in talks next Wednesday. That could cast a cloud over the visit, designed to celebrate U.S.-German ties on the 50th anniversary of a famous speech in which President John F. Kennedy declared: "Ich bin ein Berliner". Minister Sabine Leutheusser-Schnarrenberger said reports the United States could access and track virtually all...