An influential U.S. senator on Friday urged President Barack Obama's administration to suspend direct aid to Haiti's government and visas for its top officials until it ensures a fair and democratic outcome to disputed national elections.

Democratic Senator Patrick Leahy made the call as international pressure mounted on outgoing Haitian President Rene Preval's government and Haitian electoral authorities to review the contested results of November 28 elections that have triggered violent protests across the poor Caribbean country.