Sen. Lindsey Graham (R-SC), who has faced primary challenges in nearly every Senate election, has never been forced into a runoff.

The South Carolinian is spending like he's in political trouble; it's not clear that he is.

The South Carolinian is spending like he's in political trouble; it's not clear that he is.

Sen. Lindsey Graham (R-SC), who has faced primary challenges in nearly every Senate election, has never been forced into a runoff.

South Carolina voters are narrowing down candidates in key races for governor and U.S. Senate. Republicans in both contests have played up their ties to Donald Trump, who remains…

Since taking office in 2002, Graham has never been in a runoff in the Republican primary, but undecided voters could break his streak.

Graham spent millions to defeat a primary opponent, NBC News projects, after receiving President Donald Trump’s endorsement last year.

He spent more than $27 million to fend off five primary challengers in South Carolina.

Sen. Lindey Graham was targeted by former allies of Trump's MAGA movement for his hawkish foreign policy and championing of the Iran war.