Republican candidate Mitt Romney  host GOP strategist Karl Rove at a retreat for his biggest donors in Utah this weekend, raising objections about coordination between Romney’s presidential campaign and two interest groups advised by Rove, American Crossroads and Crossroads GPS.

Under federal law, candidates aren’t allowed to tell super PACs and other interest groups what to do with their money — a provision designed to limit federal officeholders from the corrupting influence of the million-dollar donations accepted by independent groups.

“As you probably know, super PACs have to be entirely separate from a campaign and a candidate,”Romney said on MSNBC. “I’m not allowed to communicate with a super PAC in any way, shape or form.