"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 ShaheenSenators pan WH proposal to cut airport security programs, hike ticket fees Dem senator: 'One of our closest allies' expressed concern about intelligence sharing Sessions postpones Senate testimony on DOJ funding 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 PaulSenate gears up for fight on Trump's 0B Saudi Arabia arms sale Paul: 0B Saudi arms deal ‘a travesty’ Senate feels pressure for summer healthcare vote MORE (R-Ky.) and Rep. Paul RyanPaul RyanCBO score underlines GOP tensions on ObamaCare repeal Overnight Finance: Dems introduce minimum wage bill | Sanders clashes with Trump budget chief | Border tax proposal at death's door Sasse: Mont. Republican doesn't understand First Amendment 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.