Conservative group FreedomWorks will endorse Tea Party candidate Greg Brannon (R) in his bid to face Sen. Kay HaganKay Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina MORE (D-N.C.), sources close to Brannon's campaign tell The Hill.

Brannon, an obstetrician who has the backing of Sen. Rand Paul (R-Ky.), will be endorsed by the national group at a Tuesday evening rally in Raleigh.

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The endorsement could help propel his candidacy in the crowded Senate primary. Brannon is facing five other candidates including North Carolina House Speaker Thom TillisThomas (Thom) Roland TillisSenate GOP urges Trump administration to work closely with Congress on NAFTA Overnight Defense: Over 500 amendments proposed for defense bill | Measures address transgender troops, Yemen war | Trump taps acting VA chief as permanent secretary Trump to nominate acting VA secretary to lead department MORE (R), the establishment favorite and front-runner, as well as Rev. Mark Harris (R), who has the backing of former Arkansas Gov. Mike Huckabee (R). If no candidate gets 40 percent of the vote in the May primary, the top two vote-getters will face off in July.

A drawn-out primary could sap the eventual nominee of resources and hurt their chances against Hagan. Most recent polls show a close general-election race.

This week doesn't bring all good news for Brannon, however. Two investors in a technological start-up he served on the board of are charging that he misled them into investing in that company, according to court documents first reported by WRAL and also obtained by The Hill. Brannon will be in civil court next week to answer the allegations.

His campaign downplayed concerns about the lawsuit.

"I'm looking forward to my day in court and I'm confident it will be resolved," Brannon said in a statement via his campaign manager.