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 PortmanRob PortmanSens submit bill to 'Hack the DHS' CBO score underlines GOP tensions on ObamaCare repeal Senate panel could pass new Russia sanctions this summer 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.

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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 McCainDefense hawks gird for budget brawl Trump got harsher GOP reception than Bush on budget Armed Services chairman unveils .1B Asia-Pacific security bill MORE’s (R-Ariz.) presidential bid.

The Obama campaign is using Sen. John KerryJohn KerryJohn Kerry channels Yoda in tweetstorm John Kerry goes on tweetstorm as Senate eyes Iran legislation John Kerry's advice to Harvard grads: Learn Russian 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 Ryan8th graders refuse to take photo with Paul Ryan Dems plot recess offensive on ObamaCare President Trump needs to make some huuuge changes, and soon MORE (R-Wis.) in Vice President Joe BidenJoe BidenThe Hill's 12:30 Report Cornell unveils Biden ice cream Biden fuels 2020 speculation 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.