SCARBOROUGH GOT IT WRONG
Dever was referring to smuggler's potential for violence, not American citizens.

http://www.msnbc.msn.com/id/6867311
SCARBOROUGH - Scarborough Country, Jan. 24:
And, Mr. Gilchrist, let me share you what a county sheriff from Arizona has said, really parroting what's just been said by the Mayor, saying this about these type of vigilante groups that you're putting together-quote-"They're willing to violently challenge law enforcement personnel, so I assure you they'll take on anybody.  The potential for violence is very real, and I issued all the cautions I possibly could." [Read Entire Segment Transcript]

http://washingtontimes.com/national/20050124-121305-5647r.htm
WHAT DEVER REALLY SAID -Washington Times, Jan 24
"Sheriff Dever said he also warned the leaders of the potential for conflict with alien smugglers, who seek to operate under the "cloak of concealment" but could become a real threat if confronted.

They are willing to violently challenge law enforcement personnel, so I assure you they'll take on anybody. The potential for violence is very real, and I issued all the cautions I possibly could," he said. "