Former U.S. President Bill Clinton helps unload a cargo plane at Port-au-Prince airport in Haiti Jan. 18, 2010. Clinton has called on Americans to donate cash to relief efforts. "The number-one thing we have to do for the next few days is to concentrate on the basics," he said. "Unless you're in a search-and-rescue team or a medical team, the best thing you can do is give money for food, water, shelter and first aid supplies. Those are the things we need," Clinton told ABC News' George Stephanopoulos in an interview for "World News."