(Newsroom America) -- Wisconsin Rep. Paul Ryan, who has made substantial headway in the Republican Party in recent months for budget plans that trim trillions in federal expenditures, is reportedly being vetted as a possible choice to become Mitt Romney's vice presidential pick.
Ryan, chairman of the House Budget Committee, has been named in the past as a possible choice, along with U.S. Sen. Marco Rubio of Florida, another potential pick that has actually been talked about more in Republican circles.
But Saturday National Review Online's Robert Costa said he's "reliably informed" that Ryan had submitted paperwork to the Romney campaign, and that other "sources" confirmed he was being vetted as a potential pick.
NRO said Ryan, a rising star in GOP ranks, has been considered a top pick by a number of GOP operatives, but some are wary of taking him from the House, where he has been able to influence the debate of the federal government's out-of-control spending.
On the Wisconsin campaign trail, Ryan stumped for Romney in late March and early April, ahead of the state's presidential primary.
NRO said Ryan's office would not comment.
"Respecting their campaign’s internal process, we’re not going to comment," said Ryan officials.
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