U.S. authorities are seeking to deport Mosab Hassan Yousef, the "Green Prince," who reportedly worked as a Shin Bet security service agent from 1997-2007.

Yousef, who now lives in the United States, had unparalleled access to Hamas, which his father, Sheikh Hassan Yousef, helped found and led in the West Bank. He first described his experiences to Haaretz earlier this year, and has since published a book, "Son of Hamas," on the subject.

Recently, however, the Department of Homeland Security asked a California court to approve his deportation, on the grounds that he "provided material support to a [Tier 1] terrorist organization" - namely, Hamas.

The request is based on quotes from Yousef's book, "Son of Hamas" - in which he described how he worked within Hamas to obtain information for the Shin Bet. Taken out of context, the quotes make it seem as if he worked for the group.

A San Diego immigration court is to hear the case on June 30. Yousef said he will appeal if it rules against him.

The deportation request is the Department of Homeland Security's response to Yousef's asylum application. Yousef, who converted to Christianity in 2005, wrote on his blog that he was stunned by the move.

"If Homeland Security cannot understand a simple situation like mine, how can they be trusted with bigger issues?" he demanded.

MK Einat Wilf (Labor ), a member of the Knesset Foreign Affairs and Defense Committee, recently began collecting MKs' signatures on a letter thanking Yousef for his contribution to Israel's security.