"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 Defense: Trump gets briefing at Pentagon on ISIS, Afghanistan | Senate panel approves five defense picks | Senators want Syria study in defense bill Gore wishes Mikulski a happy birthday at 'Inconvenient Sequel' premiere Senators ask for Syria policy study in defense bill 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 PaulSunday shows preview: Scaramucci makes TV debut as new communication chief The Hill's 12:30 Report Senate heads to new healthcare vote with no clear plan MORE (R-Ky.) and Rep. Paul RyanPaul RyanGOP divided over care for transgender troops Want bipartisan health reform? Make the debate honest again Ex-CBO directors defend against GOP attacks on ObamaCare analysis 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.