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Tillis will be the guest at a fundraiser at the National Republican Senatorial Committee. The Monday afternoon event will be headlined by Sens. Richard Burr of North Carolina and Sens. John Barrasso and Mike Enzi of Wyoming, Lamar Alexander of Tennessee, John Thune of South Dakota and Johnny Isakson of Georgia.
The event will help fill Tillis's coffers, at $2,500 per political action committee and $1,000 per person.
It's not Tillis' first D.C. fundraiser. In December Senate Minority Leader Mitch McConnell of Kentucky helped host an event at the home of Geoffrey Gray, a lobbyist who, according to The Examiner, has represented Fannie Mae and Freddie Mac. Republican strategist Karl Rove, hardly a favorite of tea party conservatives, also has headlined Tillis fundraisers.
Greg Brannon, one of Tillis's seven GOP primary opponents, has sought to make an issue of Tillis's establishment ties. Brannon has been backed by tea party favorites, Sens. Rand Paul of Kentucky and Mike Lee of Utah.
Another Republican candidate, Mark Harris, has his own fundraiser coming up Saturday. Former Republican presidential candidate Mike Huckabee will headline a Raleigh fundraiser for the Charlotte pastor.
Update: Kevin McLaughlin of the NRSC says the group does not endorse in primaries, and its Capitol Hill building is open to any GOP candidate.