The special election to replace former Rep Marjorie Taylor Greene is projected to be headed to a runoff after none of the candidates secured a majority of the votes on Tuesday night.

Republican Clay Fuller, who received President Donald Trump's endorsement, is projected to face Democrat Shawn Harris to represent Georgia's 14th congressional district, according to the BBC's US partner CBS.

The two candidates beat out a crowded field of 17 candidates for the runoff slots.

Trump put his finger on the scale, giving Fuller his "complete and total endorsement" in a Truth Social post and holding a rally in Rome, Georgia, last month.

"For those of you who questioned how important Donald J Trump is to this country, to Georgia 14, and the state of Georgia, you see what this man means to this community, what he means to the people in this country, and what he means to the MAGA movement," Fuller, a former district attorney, said on Tuesday night.