Mitt Romney will spend this upcoming week preparing for his debates against President Obama, according to reports.

According to a campaign source, Romney will go head-to-head against Sen. Rob PortmanRobert (Rob) Jones PortmanMcConnell names Senate GOP tax conferees Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him How four GOP senators guided a tax-bill victory behind the scenes MORE (R-Ohio) who is standing in for Obama to help prepare the GOP candidate, CNN first reported.

Senior Romney adviser Kevin Madden said that Romney would hold the debate preparations at the Vermont home of former Massachusetts Lt. Gov. Kerry Healey (R), a campaign surrogate, from Tuesday to Thursday.

ADVERTISEMENT
Reports said Romney’s campaign had not decided if the candidate would hold any public events this week, as Democrats meet in Charlotte, N.C. for their convention.

Romney and Obama will face off in three presidential debates this fall. 

PBS's Jim Lehrer will host the first debate on Oct. 3 at the University of Denver. CNN's Candy Crowley will host the second debate at Hofstra University in Hempstead, N.Y. on Oct. 16 and CBS's Bob Schieffer will moderate Oct. 22 at Lynn University in Boca Raton, Fla. 

Romney campaign sources confirmed last week that Portman, who was reportedly considered for the GOP vice presidential pick, had been tapped to play Obama during mock debates. 

Portman also played Obama in 2008 to assist Sen. John McCainJohn Sidney McCainGOP strategist donates to Alabama Democrat Meghan McCain knocks Bannon: 'Who the hell are you' to criticize Romney? Dems demand Tillerson end State hiring freeze, consult with Congress MORE’s (R-Ariz.) presidential bid.

The Obama campaign is using Sen. John KerryJohn Forbes KerryLobbying world Kerry: Trump not pursuing 'smart' or 'clever' plan on North Korea Tillerson will not send high-ranking delegation to India with Ivanka Trump: report MORE (D-Mass.) to play Romney in Obama's debate prep and ranking House Budget Committee member Chris Van Hollen (D-Md.) will play Rep. Paul RyanPaul Davis RyanMcConnell names Senate GOP tax conferees House Republican: 'I worry about both sides' of the aisle on DACA Overnight Health Care: 3.6M signed up for ObamaCare in first month | Ryan pledges 'entitlement reform' next year | Dems push for more money to fight opioids MORE (R-Wis.) in Vice President Joe BidenJoseph (Joe) Robinette BidenOvernight Tech: FCC won't delay net neutrality vote | Google pulls YouTube from Amazon devices | Biden scolds social media firms over transparency Medicaid funds shouldn't be used to subsidize state taxes on health care Biden hits social media firms over lack of transparency MORE's practice sessions. 

Earlier this week, Portman said that in his experience, mock debate sessions can often get heated. 

“You kinda swing back and forth — I mean, nothing physical, although it's come close at times,” said Portman, during an interview.