Let's put an end to the above misinformation: Americans were NEVER barred/prohibited/banned from traveling to Pakistan. There was a time when the state department ADVISED Americans not to travel to that country (and it probably has been reinstated today because of the turmoil there).
The questions about his passports are still valid.
Thanks. I'll remember that. I thought there was a ban. I guess I was misinformed. Still, what passport did he use? What citizenship was he claiming then? Why are his college records all sealed? (I have been told they are sealed. I have not personally gone to request them.)