Mitt Romney will announce his running mate Saturday in Norfolk, Va., his campaign said late Friday night.

"On Saturday, Mitt Romney will begin his “The Romney Plan For A Stronger Middle Class” bus tour by announcing his choice for Vice Presidential candidate in Norfolk, Virginia," read the statement from the campaign.

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The announcement will be made on the USS Wisconsin around 9 a.m. 

Media outlets reported late Friday night that Romney is poised to pick House Budget Committee Chairman Paul RyanPaul Davis RyanTrump faces test of power with early endorsements Lobbying world Boehner throws support behind Republican who backed Trump impeachment MORE (R-Wis.). A Republican source told The Hill that Romney has tapped Ryan, but the Romney campaign did not confirm the choice.

A Ryan pick would be embraced by the GOP base, as well as liberals. Democrats have repeatedly criticized Ryan's controversial budget and his proposed reforms to the Medicare system.

Romney, 42, is serving his seventh term. As Romney's running mate, Ryan will not only have to defend his budget, but he will also likely be pressed on his vote for the Wall Street bailout in 2008 and his opposition to the DREAM Act in 2010.

The presumptive GOP presidential nominee is beginning a four-day bus tour through Virginia, North Carolina, Florida and Ohio.

Some possible vice presidential choices — including Sens. Rob PortmanRobert (Rob) Jones PortmanTo encourage innovation, Congress should pass two bills protecting important R&D tax provision The Hill's Morning Report - Biden assails 'epidemic' of gun violence amid SC, Texas shootings Biden-GOP infrastructure talks off to rocky start MORE (R-Ohio) and Marco RubioMarco Antonio RubioHillicon Valley: Amazon wins union election — says 'our employees made the choice' Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists The growing threat of China's lawfare MORE (R-Fla.) — are scheduled to join Romney at various stops on the tour.

Other names mentioned for the running mate spot include former Minnesota Gov. Tim Pawlenty and Virginia Gov. Bob McDonnell.

Pawlenty and his wife, Mary, are scheduled to campaign for Romney in Manchester, N.H., on Saturday, per an announcement put out earlier Friday by the Romney campaign. Pawlenty is scheduled to appear on NBC's "Meet the Press" and ABC's "This Week" on Sunday.

— Bob Cusack contributed to this report.

— Updated at 1:51 a.m.