Rudy Giuliani served as New York's mayor for eight years, leading the city through the aftermath of the September 11 terror attacks.

Giuliani denies New York was a "sanctuary city" for illegal immigrants under his administration, an allegation leveled by opponent Mitt Romney.

Giuliani believes some illegal immigrants should have the opportunity to become U.S. citizens, but not before they learn english, American history and pay any back-taxes.

He also likes the idea of having an identification system in place that's able to confirm legal status.

On taxes, Giuliani opposes repealing the income tax and other taxes in favor of a national retail sales tax.

He also wants to make President Bush's tax cuts permanent.

The former mayor supported President Bush's plan to send additional American troops to Iraq.

He also opposes setting a date for troop withdrawal.