WASHINGTON, Aug 21: Donald Trump will play a “surprise” role when the Republican Party kicks off its national convention next week in Tampa, Florida, a party official said yesterday. The real estate mogul and reality-television star is scheduled to participate in a to-be-revealed fashion on the first day of the four-day convention, where Republicans are to formally nominate former Massachusetts Governor Mitt Romney to face Democratic President Barack Obama in the November 6 election. (agencies)