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Potential VPs to hit the trail with Romney

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(CNN) — Mitt Romney will be joined by a trio of potential vice presidential picks on his upcoming bus tour through four battleground states, sources confirmed to CNN Monday.

The presumptive GOP nominee will stump with Virginia Gov. Bob McDonnell, Florida Sen. Marco Rubio and Ohio Sen. Rob Portman on his tour, which begins Saturday.

CNN’s Peter Hamby first reported Romney’s bus tour last week, noting that he would be joined by GOP heavyweights on his stops.

The Republican candidate’s campaign announced Monday they were dubbing the trip through Virginia, North Carolina, Florida and Ohio “The Romney Plan For A Stronger Middle Class.”

McDonnell, Rubio and Portman have all been the subject of media guesswork as potential running mates for Romney, though each has declined to speculate themselves on becoming the vice presidential candidate.

CNN’s Steve Brusk contributed to this report.