Republican Sen. Richard BurrRichard Mauze BurrSenators chart path forward on election security bill Overnight Cybersecurity: Staff changes upend White House cyber team | Trump sends cyber war strategy to Congress | CIA pick to get hearing in May | Malware hits Facebook accounts Senators express concerns over Haspel's 'destruction of evidence' MORE (N.C.) suggested that Sen. Marco RubioMarco Antonio RubioGOP Senate candidates trade barbs in brutal Indiana primary Students gather outside White House after walkout to protest gun violence Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes 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 PortmanTax rules will be subject to more OMB review under new memo Ending sex trafficking tomorrow requires preventing child abuse today Doctors bristle at push for opioid prescription limits MORE (R-Ohio) and Kelly AyotteKelly Ann AyotteAudit finds US Defense Department wasted hundreds of millions of taxpayer dollars US sends A-10 squadron to Afghanistan for first time in three years No, the US did not spend million on a gas station in Afghanistan 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.