Raymond Joseph , Haiti 's ambassador to the United States , and his nephew , singer Wyclef Jean , who was called upon by PrÃ val to become a `` roving ambassador '' for Haiti , have also pleaded for donations . Raymond Joseph , Haiti 's ambassador to the United States , and his nephew , singer Wyclef Jean , who was called upon by PrÃ val to become a `` roving ambassador '' for Haiti , also pleaded for aid and donations .