Sen. John Kerry of Massachusetts, who's playing the role of Republican presidential nominee Mitt Romney in President Barack Obama's debate preparations, will join the president in Nevada this week, according to an Obama re-election campaign official.

The president travels to Nevada on Sunday, where he'll hold an evening rally. Obama will stay in Nevada to prepare for the debates before flying to Denver on Wednesday for the first debate.

The Romney campaign tells CNN that Sen. Rob Portman of Ohio, who's playing the role of Obama in Romney's debate preparations, will travel with the former Massachusetts governor on Monday to Colorado. Romney will hold a rally in Colorado that night before final debate preparations.