*Oregon: Although English is my native language, when I went to school I was taught to put a comma before Oregon, but not after. I never suspected there was an "after" rule until I started helping at WP:ERRORS. I have since learned many unfamiliar rules of grammar and rules of Wikipedia's Manual of Style. 
 *"Learn", not "learns", according to Subjunctive#Modern form. Also, "learns" doesn't sound quite right subjectively, even before I looked up that reference.  
 *The strangest-sounding word in your phrase isn't "learns", it's "the". It should be "... that President Bush ..." or "... that the president ...", but not "... that the President Bush ...". When "President" is used as a title, "the President Bush" sounds like "the Art LaPella". 
 *To suggest that a president of the U.S. learn English is obviously impolite regardless of verb inflection, so I didn't understand "more polite". Neither is more polite, but "learn" is more grammatical.