(CNN) - Two potential running mates for Mitt Romney will headline fundraisers for the presumptive Republican presidential nominee this week, sources told CNN on Saturday.
Sen. Rob Portman of Ohio will headline at least one fundraiser for Romney in Boston on Monday. On Saturday, he was in New Hampshire for a state Republican Party event.
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At a press conference on Saturday, Portman said he is "doing whatever I can to help the victory effort."
Sen. Marco Rubio of Florida will hold a fundraising event for Romney on Friday, a Romney campaign source confirmed.
Rubio is best known by voters among a list of potential Romney running mates, a recent CNN/ORC International Poll showed.
Romney also was in New Hampshire on Saturday, where he spent the week with his family at their lakeside home.
Florida, New Hampshire and Ohio are all toss-ups on the CNN Electoral Map.
ABC News previously reported that Portman and Rubio would each hold a fundraiser for Romney.
- CNN's Shawna Shepherd contributed to this report