Washington (CNN) Senate Majority Leader Mitch McConnell attacked the credibility of a woman who has come forward with allegations against Supreme Court nominee Brett Kavanaugh as the FBI investigates accusations of sexual assault and misconduct against the nominee.

In a statement released Sunday, McConnell highlighted a lawsuit brought against Julie Swetnick 18 years ago by a company she briefly worked for at the time called WebTrends Corporation. The lawsuit was dismissed shortly after it was filed in late 2000, the court documents show.

A passage from the complaint obtained by CNN reads, "Shortly after becoming employed with WebTrends, a co-worker reported to WebTrends' human resources department that Swetnick had engaged in unwelcome, sexually offensive conduct. Rather than accept responsibility for her actions, Swetnick made false and retaliatory allegations that other co-workers had engaged in inappropriate conduct toward her."

The complaint also says Swetnick provided false information on her employment application, including the claim she graduated from Johns Hopkins University, when the company said the university has no record of her attendance. She is also accused of falsely characterizing her past work experience.

Swetnick is represented by attorney Michael Avenatti, who told CNN in a statement that the claim is "completely bogus, which is why it was dismissed almost immediately."

Read More