TALLAHASSEE, Fla - Arizona's controversial immigration law is being challenged by the federal government in an attempt to keep other states from passing similar laws.  Arizona’s attempt to bypass federal law and fight immigration at the state level is becoming a rallying cry in the GOP gubernatorial primary.

The attacks started early in the Republican Primary for governor.  Now immigration is at the center of the debate.  Newcomer Rick Scott was the first to come out in support of Arizona’s new law allowing police officers to check the legal status of people thought to be in the state illegally.

An ad for Rick Scott says, “Rick Scott backs Arizona’s law.  He’ll bring it to Florida, and let our police check if the people they arrest are here legally.”

That is if Scott is elected governor, and if the new law is a success.  But the law may never have a chance to fail.  It’s scheduled to take hold July 29th, but a federal lawsuit filed this week aims at stopping Arizona.

The suit claims the Federal government has sole authority to handle immigration issues, resurrecting a debate as old as this country: state’s rights versus federal law.  Bill McCollum is chastising President Barack Obama for interfering.

Bill McCollum says, "I think he will lose in court.  I think states have the right to enforce their own laws.

Rick Scott says he’s stronger on the immigration issue than McCollum.  “Bill McCollum is the attorney general.  He has the ability to do something about this now, but he’s not acting.”

With the primary nearing, proving who is tougher on illegal immigration will likely be a fight that rages over the next month and a half.