ANALYSIS - Amid Iran sanctions drive, U.S. lobbies foreign firms

WASHINGTON (Reuters) - The Obama administration is waging a largely behind-the-scenes campaign to convince foreign companies that it is becoming too politically risky for them to do business with an increasingly isolated Iran.

On the world stage, the United States and its allies are aggressively pushing for new sanctions on Iran over its nuclear program. Out of the public eye, it has dispatched a top U.S. Treasury official to foreign capitals to talk to governments, financial regulators, banks and business leaders.