McCain tells interns it’s ‘Vice President Portman’

OVERHEARD: Sen. John McCainJohn Sidney McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R) adding some fuel to the fire of constant veepstakes buzz surrounding one of his colleagues.

Sen. Rob PortmanRobert (Rob) Jones PortmanWeek ahead in tech: Debate over online sex trafficking bill heats up 'Hillbilly Elegy' author won't run for Senate Brown, Portman urge Trump administration to move quickly on a steel decision 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.