I just listened to the Undersecretary of the Treasury on C-SPAN. He oversees policy.
So, despite the fact that the Undersecretary is in charge of policy and delegates day-to-day operations, you're saying that the actual Secretary is hands-on for every investigation?
I don't think you know very much about how government actually works. And google won't help you with that.
Sure, why not? You and many others seem to be upset that Dubya didn't know about it (nor should he have).
The Exon-Florio provision is implemented by the Committee on Foreign Investment in the United States ("CFIUS"), an inter-agency committee chaired by the Secretary of Treasury.
http://www.treasury.gov/offices/international-affairs/exon-florio/