Jan Brewer authorizes erection of a security fence along Arizonas portion of the U.S.-Mexico border, either clothed in a compact with other states or else by itself.Spokesman Matt Benson declined immediate comment Friday on why Brewer signed the damage Thursday and on whether she strategy to invoke the authority.The demand for payment does not itemize a cost before designate an appropriation but says the state would purpose donations, prisoner labor and not public contractors.Brewer recently asked President Barack Obama to tender the use of nationwide Guard troops along the border and intended for supplementary significant border fences to wedge smugglers.