"New Hampshire has always been a special place for Governor Romney. It's the state where he launched his presidential campaign, where he spends time with his family every summer, and it's a place where he will always have many friends and loyal supporters," New Hampshire Republican Party Chairwoman Jennifer Horn said in a statement announcing the fundraiser.

"We are thrilled that Governor Romney has agreed to host one of his first fundraisers since the election for our party and help New Hampshire Republicans restore fiscal sanity to Concord and Washington."

According to WMUR, state Sen. Jeb Bradley "will play a major role" in the fundraiser. Bradley has long been leaning towards challenging Sen. Jeanne Shaheen Jeanne ShaheenOvernight Finance: US preps cases linking North Korea to Fed heist | GOP chair says Dodd-Frank a 2017 priority | Chamber pushes lawmakers on Trump's trade pick | Labor nominee faces Senate Lawmakers want Trump commitment to help Iraq post-ISIS Overnight Defense: FBI chief confirms Trump campaign, Russia probe | Senators push for Afghan visas | Problems persist at veterans' suicide hotline MORE (D-N.H.), but he hasn't yet made his run official.

Romney has been a frequent benefactor to the New Hampshire GOP, hosting fundraisers for the state party ahead of his participation in the 2008 and 2012 presidential primaries.

The event will come just two months after Romney hosted a retreat in Utah for top Republican donors. Attendees at that event included New Jersey Gov. Chris Christie (R), Sen. Rand PaulRand PaulGOP rep: Trump could be 'one-term president' if healthcare bill passes Overnight Defense: Pentagon chief urges Congress to approve budget boost | Senate fight over NATO addition Defying Trump, Freedom Caucus insists it'll oppose GOP ObamaCare replacement MORE (R-Ky.) and Rep. Paul RyanPaul RyanHigh drama for ObamaCare vote Freedom Caucus, Trump reach 'agreement in principle' on ObamaCare repeal bill Schiff: Evidence of Trump team collusion with Russia 'more than circumstantial' MORE (R-Wis.), Romney's 2012 running mate.

Romney and top aides to his campaign also have donated in recent weeks to Ryan's reelection campaign, according to documents filed with the Federal Election Commission.

Romney donated $5,200 to Ryan, while Beth Myers, one of the campaign's top political strategists, and Spencer Zwick, the Romney fundraising chairman, each donated $2,500. The donations were made to a joint fundraising committee that splits donations between Ryan's reelection committee and his leadership political action committee.

This story was updated at 12:37 p.m.