It's been four weeks since Pakistan's new prime minister Nawaz Sharif was sworn into office. He's had a difficult start. He's faced a wave of militant attacks and an economically crippling electricity crisis. Now his job has become even harder. Many Pakistanis consider U.S. drone attacks against targets in their tribal belt as a violation of sovereignty. Recently, there's been a lull in these attacks. But overnight there was a fresh missile strike that killed at least 17 people and presented Sharif's government with a quandary.