"Doesn't the president have final say if an injunction is actually to be inforced? ie. requires his signature."

I believe it is the opposite.
The President has 60 days to review the ID and disapprove it otherwise it becomes final by default after the 60 days or by positive approval during the review period.

http://www.daypitney.com/itc/

" The Commission's determination is subject to a 60-day Presidential review period (though Presidential vetoes are rare). Appeals from the ITC decision are to the U.S. Court of Appeals for the Federal Circuit."

and

http://www.cbp.gov/linkhandler/cgov/trade/legal/directives/2310-006a.ctt/2310-006a.pdf

Exclusion Orders issued by the ITC are sent to the President for review. During the 60 day review period, if the order is not disapproved by the President or if the President affirmatively approves the order during this period, the order becomes final. Customs enforces Exclusion Orders both prior and subsequent to their becoming final. In cases involving importations which occur within the 60 day Presidential review period, the otherwise excludable articles may be entered under a single entry bond on Customs Form 301, containing the bond conditions set forth in 19 CFR § 113.62 in an amount determined by the ITC. After the Presidential review period, where the Exclusion Order becomes final, the bond conditions no longer apply and the goods are subject to exclusion.

The second reference is interesting in that it seems to say that the Exclusion is immediate, rather than waiting for a Presidential approval or the expiration of 60 days. If so, it means an embrado could/would hot the holiday period.
This is an old article - does anyone know if this part has been softened over the years?