http://twitter.com/#!/CungLe185/media/slideshow?url=http%3A%2F%2Ftwitpic.com%2F6fmuth Directly from his website. It would not make sense to represent the USA if he was not a citizen of the USA?

"I talked to a coworker" is not a reliable source. I'm not sure how Twitter counts, but I'd assume that if he has his own personal Twitter account that counts as a primary source. Barring a reliable secondary source on what citizenship he has, primary sources trump "I talked to a coworker", I believe. -  One ping only 
 He just tweeted this -http://scribe.twitter.com/#!/cungle185  @Luv4theGame I am a US citizen. Who cares what they say! They have nothing better to do with their time. Bushranger, I believe it is within my rights to use this information and finally close this issue because Cung Le has specifically stated that he is a U.S. citizen. I will now go and revert his pages, if you think I am violating Wikipedia rules. Please let me know, and I will stop. Again, I am trying to handle this as civil as possible. His twitter account is verified, and is listed on Facebook page, CungLe.com, and on the OFFICIAL UFC.com page. This is the UFC.com page, his tweets are clearly shown as well http://www.ufc.com/fighter/Cung-Le