Five congressman are part of this bill. This is getting pretty interesting, the U.S. cries about everything when they don't get their way... the
damage is done, and they're trying to prevent the flow of these jets maybe. This clip is from the additional news links:

According to an October 23rd report by Russia’s Kommersant, “Iran has signed a contract with China for the delivery of two squadrons of J-10
fighter planes…Representatives of the Iran Aircraft Manufacturing Industrial Company said China would deliver the total (24 jets) in 2008-2010.
Engines for the jets will be supplied by Russia…estimating one fighter at $40 million, put the contract’s value at $1 billion.”
en.rian.ru
(visit the link for the full news article)