Republican Dave McCormick, an Army veteran and former hedge fund CEO, has unseated three-term Democratic incumbent Bob Casey Jr. in Pennsylvania’s nationally watched U.S. Senate race, according to The Associated Press.

Sen. Bob Casey’s refusal to concede the election is damaging the citizens of Pennsylvania. Republican Dave McCormick defeated the three-term incumbent in an upset one week ago. Casey initially refused to concede the election until the commonwealth hand-counted all the Nov.

Pennsylvania Sen. Bob Casey accused Republican challenger Dave McCormick of trying to "disenfranchise" voters through lawsuits over provisional ballots.