A slip of the tongue or what?

http://www.jsonline.com/news/statepolitics/paul-ryan-lays-out-immigration-proposals-in-racine-town-hall-b9962573z1-217134531.html

Ryan added, "So, yes, it may be difficult and it might take 15 years for a person to get right. But I think that's a pretty good deal given that we have all these undocumented Americans."

Well, which one is it, Congressman Ryan? Is it undocumented immigrants in America or undocumented Americans who are immigrants?