Republican Sen. Richard BurrRichard Mauze BurrSenate confirms Haspel to head CIA The Hill's Morning Report: Mueller probe hits one-year mark Divisions deepen as Mueller probe hits one year MORE (N.C.) suggested that Sen. Marco RubioMarco Antonio RubioCongress — when considering women’s health, don’t forget about lung cancer Anti-Maduro Venezuelans not unlike anti-Castro Cubans of yore Tax reform postmortem reveals lethal dose of crony capitalism MORE (R-Fla.) could use "a little more experience" before being picked as Mitt Romney's presidential running mate.

Burr's comments were in response to a question on who Romney should pick for the vice presidential slot. Burr first listed Sens. Rob PortmanRobert (Rob) Jones PortmanWATCH: Sen. Flake: “More doubtful” North Korean summit will happen  Lobbying world Trump-backed congressman wins Ohio Senate primary MORE (R-Ohio) and Kelly AyotteKelly Ann AyotteThe Hill's Morning Report: Koch Network re-evaluating midterm strategy amid frustrations with GOP Audit finds US Defense Department wasted hundreds of millions of taxpayer dollars US sends A-10 squadron to Afghanistan for first time in three years MORE (R-N.H.), as well as former Minnesota Gov. Tim Pawlenty. Ayotte, like Rubio, is a freshman senator.

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"The conventional wisdom will tell you a Rob Portman out of Ohio. A longshot would be a Kelly Ayotte out of New Hampshire, where geographically there's not a huge number of electoral votes that come out of there but somebody incredibly capable, a female, a little different twist," Burr said in a radio interview with Charlotte, N.C., radio station WBT on Tuesday. "And then you could see something as generic as former Governor Pawlenty who brings his expertise and own experience in Minnesota."

Burr was then asked about Rubio, another name often listed as a top pick for Romney. Rubio is a Tea Party favorite who was elected to the Senate in 2010.

"We have qualified candidates, some are younger than others and many of the younger ones you'd like to see get a little more experience under their belt so that they pass that instantaneous test in their minds: could they be president tomorrow?" Burr said.

Earlier in the day Romney's campaign unveiled a new smartphone app for first announcing his vice presidential pick. Rubio, despite wide speculation that he would be asked to be Romney's running mate, has said he would not be picked for the job. Still, Rubio has made a number of campaign stops for the former Massachusetts governor over the past few months.