(repeating to fix typographical errors in headline)

By Evelyn Leopold

UNITED NATIONS, Feb 13 (Reuters) - Two U.S. legislators asked Cyprus on Tuesday to extradite Benon Sevan, a former U.N. official charged with accepting a bribe in connection with the oil-for-food program for Iraq.

Sevan, 69, the former head of the now-defunct $64 billion program is the only U.N. official charged by U.S. federal prosecutors for wrongdoing in the oil-for-food plan. He is accused of receiving some $160,000 through an intermediary.

But as recently as last week, a Cypriot government official said in Nicosia said there had been no request for Sevan's extradition and that the island had laws prohibiting extradition of its nationals to third countries.

The two lawmakers were Rep. Tom Lantos, a California Democratic who chairs the House of Representatives Foreign Affairs Committee, and the committee's ranking Republican, Rep. Ileana Ros-Lehtinen of Florida.

In a letter to Andreas Kakouri, the Cypriot ambassador in the United States, e-mailed to reporters, the members of Congress said Cyprus' membership in the European Union was seen as "heralding a new era of international cooperation by your country."

"In this context, we trust that your government will undertake robust efforts to investigate, locate and extradite Mr. Sevan, so that he may be fairly tried for his alleged violations of United States law and international confidence," their letter said.

Sevan, a native of Cyprus, was charged in federal court in New York last month, along with Ephraim Nadler, 79, a businessman and brother-in-law of former Secretary-General Boutros Boutros-Ghali. Nadler was accused of funneling Iraqi money to Sevan.

Sevan has denied the charges through his lawyer, Eric Lewis, who said the United States was using his client as a scapegoat. When the U.N. program closed in 2003 Sevan turned over $10 billion to the United States in Iraq, money that Lewis said "vanished and has not been accounted for since then."

The U.N. program was designed to soften the blow to civilians of U.N. sanctions against Iraq by allowing Baghdad to sell oil to finance purchases of humanitarian goods. The sanctions were imposed after Baghdad's troops invaded Kuwait in 1990. The oil program began in late 1996 and ended in 2003.

The former government of Saddam Hussein's raised $1.8 billion through kickbacks and surcharges on the sale of oil in the program. But Saddam probably earned $10 billion more from oil that he smuggled out of the country outside of the U.N. program, an independent probe of the program said.

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