By The Associated Press

Lawyers for Arizona Gov. Jan Brewer are asking a federal appeals court to turn back the latest effort by foes to block the most contentious part of the state's tough new immigration law.

Opponents of part of the law requiring police to question some people they contact about their immigration status want the 9th U.S. Circuit Court of Appeals to block its enforcement. That provision survived a U.S. Supreme Court review.

Brewer's lawyers told the appeals court in a filing late Friday that the high court has already spoken on the matter. They say opponents have brought no new arguments that would prevail and make it proper to block enforcement of the law.

The provision went into effect last week after a federal judge in Phoenix said it could be enforced.

Meanwhile, organizers of an immigrant rights rally say hundreds of protesters marched on Saturday to the Maricopa County jail in downtown Phoenix to express their outrage at Arizona's immigration law.

Salvador Rez says 300 to 400 people rallied outside the Fourth Avenue Jail on Saturday. Chris Hegstrom of the sheriff's office estimated that number was closer to 100 to 150.

Protesters marched from a nearby restaurant, holding signs and chanting. Rez says law enforcement did not interact with them.

Rez says some protesters included the first people arrested under the new law who had been released by immigration officials because they were not criminals.