US Senator John McCain, whose town hall-fueled 2000 and 2008 New Hampshire GOP presidential primary wins etched him into Granite State political lore, is set to campaign with Scott Brown on Monday — at a town hall focused on foreign policy.

McCain will appear with Brown, who is vying to unseat Democratic Senator Jeanne Shaheen, in Derry, N.H., at a town hall “focused on foreign policy, and how to restore America’s leadership standing in the world, which has been damaged under the failed policies of President Obama,” according to a Brown campaign news release.

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A Brown spokeswoman, Elizabeth Guyton, said the trip would serve as McCain’s official endorsement of Brown’s Senate effort.

Brown, the former US senator from Massachusetts, has been holding a series of town halls on different topics, and this will be his third.

McCain, Republican of Arizona, won New Hampshire’s first-in-the-nation Republican presidential primary in 2000, but lost the GOP nomination to George W. Bush.

In 2008, McCain was his party’s nominee, but lost the general election — including New Hampshire — to Barack Obama.

Brown faces a GOP primary challenge but is expected to be his party’s standard bearer and face Shaheen on Nov. 4.

McCain isn’t the only one-time Republican presidential nominee who is backing Brown.

Former Massachusetts governor Mitt Romney officially threw his support behind Brown at a rally last month.

Read more:

• Role of political outsider reconsidered

• Opinion: Brown’s presence still being felt in Washington

• Politicians keep writing — but who’s reading?

Joshua Miller can be reached at joshua.miller@globe.com. Follow him on Twitter @jm_bos.