If he is killed, then the Federal Government has “officially” failed to “...protect them from invasion...” and its time to bring the all NG home to the job the Feds won’t.
Which would be the job of governor Brewer (since the feds have failed to act). There are a lot of dynamics at play here. SB 1070 to begin with. The administration's lawsuit against that bill yet inaction to fulfill its obligation to border security. A threat to a prominent county official. The State of Arizona sovereignty issue.
If something does happen to this officer (I pray it doesn't), it will be a catalyst. of what remains to be seen...