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WASHINGTON - The Obama administration is increasingly questioning the long-term stability of Tehran's government and moving to find ways to support Iran's opposition "Green Movement," said senior U.S. officials.

The White House is crafting new financial sanctions specifically designed to punish the Iranian entities and individuals most directly involved in the crackdown on Iran's dissident forces, said the U.S. officials, rather than just those involved in Iran's nuclear program.

U.S. Treasury Department strategists already have been focusing on Iran's Revolutionary Guard Corps, which has emerged as the economic and military power behind Supreme Leader Ayatollah Ali Khamenei and President Mahmoud Ahmadinejad.

In recent weeks, senior Green Movement figures -- who have been speaking at major Washington think tanks -- have made up a list of IRGC-related companies they suggest targeting, which has been forwarded to the Obama administration by third parties.

Names on the list include Iran's largest telecommunications provider, Telecommunication Company of Iran, which is majority-owned by the IRGC, and the Iranian Aluminum Co. A U.S. official involved in Iran said the administration wouldn't comment on whether it was acting on the information.

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