University of Nevada political forum August 20, 2007

The Brookings Institution, a nonpartisan public policy think tank based in Washington, is cosponsoring the events with the university and ABC News.

School spokeswoman Jan Tors says the institute is in the process of sending out invitations to the four Republicans -- former New York Mayor Rudy Giuliani, former Massachusetts Governor Mitt Romney, Arizona Senator John McCain and Texas Congressman Ron Paul.