(CNN) - Sen. Rob Portman, widely speculated to be a potential vice-presidential pick for Mitt Romney, will undertake another high-profile surrogate task for the presumptive GOP nominee Monday: pre-butting President Barack Obama's campaign speech in Cincinnati.
Portman will address supporters in Lebanon, Ohio, mid-day on Monday, hours ahead of Obama's visit to nearby Cincinnati.
Last week Portman said he met with Romney campaign staffers during three meetings while in Boston to headline a couple of fund-raisers for the presumptive Republican presidential nominee.
But Portman said the meetings were not at the Romney campaign headquarters, and had nothing to do with the vice-presidential vetting process.
Portman, a former congressman and cabinet member in the George W. Bush administration, spoke to reporters Tuesday after giving a speech to a builders and contractors association meeting in the nation's capital.
The freshman senator, who's now a leading surrogate for Romney's White House bid, said he speaks to the campaign on a regular basis, especially regarding how the race is shaping up in his home state of Ohio, a crucial battleground in the election.
CNN's Kevin Bohn and Steve Brusk contributed to this report.