So..... He thought the President would open it and.... Lick the letter? Have sex with it? Really unlucky papercut? Not that any physical letters would ever reach the PotUS's desk anyway.
I'm more aghast that:
1. The guy got in.
2. The guy has been on the taxpayer dime for three years. No job, ever.
3. This is the SAME guy who set a fire in a Chicago intersection in 06 and was running around yelling "allah akbar".
4. The guy is still in the US. WHY?!
5. Now we have to pay for his care, too, because he's nuts.
6. Sane, working professionals from strong ally nations are denied entry. Leeches from ickystans get let in.
Not a credible threat, but you would think it'd be a wake-up call.