Members of Congress can also ask their local law enforcement agency for a two-officer detail, if they believe a threat exists, retired NYPD Sgt. John Negus tells POLICE Magazine.
However, local law enforcement often suffers from a manpower crunch that can limit security provided by patrol officers.
"Most police department don't have capacity to do that," Negus said. "In certain areas, if you only have four guys on patrol are you going to take them off patrol to babysit some politician? If any official feels there's a need, they should approach the police department and they'll do what they can."
Negus once oversaw the NYPD's intelligence unit that provides security for top-level and second-in-command diplomats from 93 countries with business at the United Nations. He's now an assistant executive director with Executive Protection Institute, which trains law enforcement officers, military personnel and private security.
Prior to her Safeway event on Saturday, Rep. Giffords had spoken publicly about violent threats made against her and vandalism to her office. She told
MSNBC
that "we can't stand for this," after vandals smashed her Tucson office window following her support of President Obama's healthcare bill.