The question is not can Congress challenge but will they ?
No offense to Pukin Dog, but this is anything but "over". Congress can do practically anything it wants if it has the votes to override a veto. A good example of this would be how the reconstruction era congress totally took Andrew Johnson to the woodshed.
If congress wanted to, it would disovled CIFUS and disolve all of the port leases. The president couldn't do anything about and neither could the SCOTUS.
BTW, contray to what Pukin Dog alledges, Congress most certianly does have foreign policy power - the approval of treaties is a glaring example.
[i]The question is not can Congress challenge but will they ?[/i]
according to the leaders of both houses there is a nearly veto proof majority to sink this deal