Republican Bob Hugin is going nuclear against incumbent Democratic Sen. Bob Menendez in the final days of the closer-than-expected New Jersey Senate race, reviving salacious allegations that the senator had sex with underage prostitutes during past trips to the Dominican Republic.

Menendez has long denied the allegations as a smear since they first surfaced on a news site in 2012.

But Hugin, a wealthy pharmaceutical executive, is now running an explosive new television ad that cites papers filed in federal court by prosecutors in 2015 acknowledging the FBI probed the prostitution allegations as part of its corruption case against Menendez.

“It’s right here in this shocking FBI affidavit,” the ad’s narrator says. “President Obama’s Justice Department had evidence that for several years, Senator Menendez had been traveling to the Dominican Republic to engage in sexual activity with prostitutes – some of whom were minors.”

Prosecutors declined to bring charges related to the prostitution claims, though they did pursue a bribery case against him. A mistrial was declared last year after the jury failed to reach a verdict in that case.