[goodcanadian]

Basically, the point of an extradition hearing is to determine whether what he is charged with is a crime under both US and UK law. If yes, he can be extradited unless it can be shown that there is an ulterior motive in requesting the extradition or that he won't receive a fair trial.

The actual trial would occur in the US, so at this point, there is very limited scope to argue the merits of the charges themselves.

As for ulterior motives, it seems pretty clear to me that the motivation is political, but proving that is difficult. Likewise, proving that he won't get a fair trial in the U.S. will be an up hill battle even if I am somewhat skeptical, myself.