A Brazilian who got US citizenship, helped create thousands of jobs in the US, moved to Singapore in 2009 and effectively lives and works there since then, appl

A Brazilian who got US citizenship, helped create thousands of jobs in the US, moved to Singapore in 2009 and effectively lives and works there since then, applied to drop his US citizenship in January 2011 and will pay the exit tax for it will now potentially be subjected to an illegal (re constitution) retroactive law to "punish" him when the main reason (I speculate) he decided to do so is the crazy American legislation that wants expats to pay their taxes twice (abroad and at home) even if they really live and work abroad? Ah..it's election year