Sen. Lindsey Graham has a widened lead against his Democratic opponent Jaime Harrison in what is expected to be one of the closest Senate races, according to a statewide poll released Tuesday.

The Republican from South Carolina has 48% support, compared to Harrison’s 42% support, the Morning Consult poll found. The survey was conducted among 903 likely voters from Oct. 2 to Oct. 11, after President Trump nominated Amy Coney Barrett to the Supreme Court.