Last night someone on CNN, maybe Wolf Blitzer, came out and said twenty million illegal aliens were in the US. He didn't call them 'aliens', they were 'immigrants'.
I think that the new language may be appropriate. The President seemed to come at the problem from two directions. First, seal the borders to stop the wholesale migration. Second, deal fairly and equitably with the millions of undocumented persons who remain. Subject to that policy being ratified policy by Congress it would seem to me that the illegal aliens can now be called undocumented immigrants.