Katie Arrington

Katherine Elizabeth Arrington (née Stolark; born December 6, 1970) is an American politician who was in the South Carolina House of Representatives from the 94th district for a single term, from 2017 to 2019. In 2018, she defeated former South Carolina Governor and incumbent Congressman Mark Sanford in the Republican primary for South Carolina's 1st congressional district but lost to Democrat Joe Cunningham in the general election. In the 2022 Republican primary, she sought to win the nomination again, but was defeated by incumbent representative Nancy Mace.

She was appointed chief information security officer for acquisition for the Office of the Under Secretary of Defense for Acquisition and Sustainment in 2020. She had served acting Chief Information Officer of the Department of Defense from March 2025 to December 2025.

Early life and education Arrington was born in Fairfax, Virginia. As a child, her family moved to Syracuse, New York. After high school, Arrington attended Canisius College in Buffalo, New York, but left during her sophomore year to marry her first husband, Doug Homrich.

2018 U.S. House campaign

Arrington announced she would run for Congress in South Carolina's 1st congressional district, challenging Mark Sanford for his seat in the House in the 2018 election cycle. The Republican primary drew national media attention as it was seen as a test of how independent of President Donald Trump a Republican representative could be. Sanford had repeatedly criticized Trump since he took office. Only four Republican House members voted against Trump's interests more often than Sanford. During the campaign, Arrington ran ads criticizing Sanford for being insufficiently supportive of Trump. Her predecessor in the statehouse, Jenny Horne, had given up her seat to mount an unsuccessful challenge to Sanford in 2016.

During the race, it drew attention that Arrington, who made her pro-Trump views the centerpiece of her campaign, appeared to have been critical of Trump in 2016. In a March 2016 Facebook post, she praised Mitt Romney on the night that he delivered a rebuke of then-candidate Trump, whom Romney called "a phony, a fraud" and someone who was "playing the American public for suckers". Arrington also supported Marco Rubio in the 2016 Republican primary for the presidential nomination.

In June 2018, Arrington defeated Sanford in the Republican primary, earning 50.5% of the vote to Sanford's 46.5%. Arrington became the second person to defeat an incumbent Republican member of Congress in the 2018 election cycle.

In November 2018, Arrington was narrowly defeated in the general election by Democratic nominee Joe Cunningham.

Department of Defense Arrington joined the U.S. Department of Defense in 2019 as a "highly qualified expert" and later competed for and joined the nonpartisan Senior Executive Service. She served as the chief information security officer for acquisition for the Office of the Under Secretary of Defense for Acquisition and Sustainment.

2022 U.S. House campaign

On February 8, 2022, Arrington announced that she would again seek the nomination for South Carolina's 1st congressional district, this time against incumbent Nancy Mace. On February 9, she received the endorsement of former president Donald Trump. A South Carolina Medal of Honor recipient, Retired Maj. Gen. James Livingston, endorsed Arrington. Arrington lost the nomination to Mace. In 2010, she married Robert Arrington, the owner of RLA Associates.

On June 22, 2018, Arrington was seriously injured in an accident when a drunk driver going the wrong way on a highway struck her vehicle. Arrington suffered a back fracture and broken ribs and had to have portions of her small intestine and colon removed.

Electoral history