Sen. John McCainJohn Sidney McCainAfghanistan is our longest war ever and Congress has abandoned all responsibility Kremlin: ‘We have a long way to go’ before any breakthrough with US The GOP is Trump's party now MORE (R-Ariz.) is making a campaign stop for New Hampshire GOP Senate nominee Kelly AyotteKelly Ann AyotteAudit finds US Defense Department wasted hundreds of millions of taxpayer dollars US sends A-10 squadron to Afghanistan for first time in three years No, the US did not spend million on a gas station in Afghanistan MORE on Saturday.

The 2008 presidential nominee will appear in Nashua to boost her bid to win the seat of retiring Sen. Judd Gregg (R-N.H.), according to a tweet on his 1.7 million-follower account.

Earlier this month, Ayotte survived a primary challenge from Tea Party-backed candidate Ovide Lamontagne, who was backed by McCain's Senate colleague Jim DeMint (R-S.C.) 

Since then, DeMint has given $100,000 to the New Hampshire GOP to aid Ayotte's campaign, according to spokesman Matt Hoskins.

Ayotte was a top tier recruit for the National Republican Senatorial Committee (NRSC), but several other NRSC-backed candidates such as Colorado's Jane Norton and Kentucky's Trey Grayson lost primary races to candidates with Tea Party support.

The GOP nominee holds a 15-point lead over Democratic nominee Rep. Paul Hodes (N.H.) in a recent in-state poll

-- This post was updated at 8:59 p.m.