Former New York Mayor Rudy Giuliani will give the keynote address at the Republican National Convention next month and Democrat-turned-independent Sen. Joe Lieberman also will take center stage at the GOP gathering.

John McCain's vanquished Republican primary rivals -- and a slew of potential McCain running mates -- also have speaking roles at the four-day gathering in St. Paul, Minn.

President Bush, Vice President Dick Cheney, first lady Laura Bush, California Gov. Arnold Schwarzenegger and Lieberman, who...