Republican Sen. Richard BurrRichard Mauze BurrGOP lambasts Trump over performance in Helsinki GOP Intel chairman: Trump should recognize Putin lies The Hill's Morning Report — Sponsored by Better Medicare Alliance — Trump seeks `home run’ candidate to succeed Justice Kennedy MORE (N.C.) suggested that Sen. Marco RubioMarco Antonio RubioRubio: Trump's remarks on Russian election meddling 'not accurate' The Hill's Morning Report — Trump, Putin meet under cloud of Mueller’s Russia indictments Scottish beer company offering ‘tiny cans’ for Trump’s ‘tiny hands’ 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 PortmanGOP moderates hint at smooth confirmation ahead for Kavanaugh Sens introduce bipartisan bill matching Zinke proposed maintenance backlog fix On The Money: Trump backs off investment restrictions on China | McConnell opens door to tariff legislation | Supreme Court deals blow to public-sector unions, ruling against 'fair-share' fees MORE (R-Ohio) and Kelly AyotteKelly Ann AyotteNew Hampshire governor signs controversial voting bill Former Arizona senator to shepherd Supreme Court nominee through confirmation process Shut the back door to America's opioid epidemic 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.