Fresh off the best fundraising stretch of his presidential campaign, Mitt Romney plans to spend this weekend strategizing and fraternizing with his biggest bundlers at a posh resort in Park City, Utah.

The presumptive nominee and his senior advisers and aides are hosting two days of policy sessions and campaign strategy discussions at a Deer Valley resort for more than 100 top fundraisers and their spouses. Those who raised more than $100,000 are expected to attend.

More than a dozen Republican heavy-hitters are scheduled to join the private retreat as special guests. According to a fundraiser who is attending, guests include some GOP stars believed to be contenders to be Romney’s vice presidential running mate: Rep. Paul Ryan (Wis.), Louisiana Gov. Bobby Jindal and Sen. John Thune (S.D.).

Bush strategist Karl Rove, who helps run American Crossroads, the well-funded GOP super PAC, is planning to speak at the retreat, said the fundraiser, who was not authorized to speak publicly about the event. Rove’s appearance could raise questions because of campaign finance laws barring any coordination between super PACs and actual campaigns.

Sen. John McCain (Ariz.), the party’s 2008 presidential nominee, also is scheduled to attend, according to the fundraiser.