Bureaucratic inertia is part of it.   Thirty one days into the administration is probably most of it.  

Also, Eugene is just too unimportant.  It isn't even a small frog in a small pond.  

San Francisco is a 'Sanctuary City'.  So is Los Angeles.  So is Seattle.  

LA, with its extensive Latino gang structure is where I would go if I were AG Sessions.  You will get enough gang bangers arrested so that those who are merely illegal aliens will be collateral damage.  

Who wants to defend the San Francisco killer of the woman on the bay who had been deported five times and said he stayed in San Francisco because it was a sanctuary city?

Same thing for the LA gang bangers.