A poll released Tuesday by Morning Consult shows incumbent Sen. David Perdue, R-Ga., with a slim lead over Democratic challenger Jon Ossoff. The survey shows Perdue at 45% support among likely voters, with Ossoff at 42%.

The survey comes as Perdue faces anti-Semitism allegation after his campaign ran an ad on Facebook showing Ossoff with an elongated nose. Ossoff, who is Jewish, said the ad uses “the oldest, most obvious, least original anti-Semitic trope in history.”

The Perdue campaign blamed the ad on an outside vendor.

“In light of an unfortunate and inadvertent error involving one of our Facebook advertisements produced and placed by an outside vendor, our campaign will be making a change to a new digital fundraising company,” Perdue campaign manager Ben Fry said in a statement. “Senator Perdue did not know about nor see the ad before it ran, and he is committed to ensuring future mistakes of this kind do not occur.”

The Perdue campaign has pointed to the Republican’s co-sponsorship of a Senate resolution last year condemning anti-Semitism to defend the incumbent.

Georgia has a fairly large Jewish population, with 128,720 Jewish residents in the state as of 2019, according to the Jewish Virtual Library. The greater Atlanta area reportedly has the ninth-largest Jewish population in the country.

Perdue, 70, has served in the Senate since 2015. He has a strong conservative record and is a staunch supporter of President Trump.

Ossoff, 33, has served as CEO of documentary film company Insight TWI since 2013. In a 2017 special election, he suffered a tight loss to Republican Rep. Karen Handel in a runoff vote for U.S. House seat.