Sen. Darline Graham Nordone (R-SC), sister of late Sen. Lindsey Graham, admitted during a debate against Rep. Ralph Norman (R-SC) that she is “not that informed” on national security.

When asked whether Taiwan and the South China Sea are national security issues for the United States, Nordone responded: “I’m just going to be honest here; I’m not that informed on national security.”

Nordone emphasized her support for the military, noting her brother’s 33 years in the U.S. Air Force and her father’s service in the Army. “My brother was in the Air Force for 33 years, so I will do everything I can to support the military,” she said. “My dad was in the Army. I’m not a polished politician up here. National security is not my thing, not my area of expertise.”

The moment drew boos from the audience and underscored her biggest vulnerability in the race to succeed her brother. Nordone has President Trump’s endorsement but lacks the experience of her opponent, who explained Taiwan’s economic significance as an ally for the United States.

During a debate held at an opera house in Newberry, South Carolina, Nordone also stated that South Carolina has a population of 50 million people, half of whom live paycheck to paycheck. Rep. Norman corrected her, noting the state’s actual population is 5.5 million.

Former United Nations Ambassador and South Carolina Governor Nikki Haley, who endorsed Norman as Graham’s runoff opponent, criticized Nordone: “Lindsey Graham was well informed on national security. Darline Graham admits she’s not.”

The candidates finished second behind Norman in the August 11 special primary but neither advanced to the runoff.