How did he get in?

Washington Times, via Iran Focus:

The Bush administration yesterday was at a loss to explain the rare presence in Washington of an Iranian government official who slipped into the United States under mysterious circumstances, apparently to attend a scholarly conference.

Or maybe the better question is, how did we find out? Apparently from the Financial Times. Nice of them to let us know. And who invited him?

Turns out he is a top aide to Iran's nuclear negotiator.