In hearings on Wednesday, members of Congress sharply questioned Secretary of Homeland Security Janet Napolitano on the possibility of virtually sealing off the border with Mexico.

• 在周三的听证会上，国会议员尖锐质疑国土安全部秘书珍妮纳波利塔诺关于封锁同墨西哥接壤边界的可能性。