McCain tells interns it’s ‘Vice President Portman’

OVERHEARD: 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 (R) adding some fuel to the fire of constant veepstakes buzz surrounding one of his colleagues.

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) was giving a group of interns a tour of the Capitol on Thursday when McCain breezed by.

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The senior senator from Arizona quipped to Portman’s young crew, “Now you can say you interned for Vice President Portman.”

Portman is said to be on Mitt Romney’s shortlist of potential running mates.

— Elise Viebeck and Jeremy Herb 
contributed to this report.