Republican Sen. Richard BurrRichard BurrSenators introduce dueling miners bills Trump education pick to face Warren, Sanders Senate Intel panel to probe Trump team's ties to Russia MORE (N.C.) suggested that Sen. Marco RubioMarco RubioGOP, Dems hear different things from Trump Senate committee to vote Monday on Tillerson Tillerson met with top State official: report 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 PortmanRob PortmanHillary gives Bernie cool reception at Trump inaugural lunch GOP governors defend Medicaid expansion Senators introduce dueling miners bills MORE (R-Ohio) and Kelly AyotteKelly AyotteTen rumored Trump Cabinet picks who didn't get a job Sasse, Perdue join Armed Services Committee Avid pilot among GOP senators joining Transportation committee 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.