A controversial TV ad from Alaska Sen. Mark Begich was rated "pants on fire" by a national fact-checking website, adding to the negative publicity stirred already by the spot.

The ad, the first run by a Senate campaign to be pulled this election cycle, faulted Begich's Republican opponent, former attorney general Dan Sullivan, for the release of a man now charged with murder and sexual assault.

Though the ad is no longer on the air, the fact-checkers at PolitiFact said “the timing just doesn’t line up” to what the ad claims about the 2013 crime.

The chain of events “happened before Sullivan became attorney general,” according to PolitiFact. “So to pin the error on Sullivan is wrong, and to suggest that he actively approved the sentence is a fabrication.”

Begich’s campaign declined to talk with PolitiFact about the ad.

The Alaska Senate race is considered one of the most competitive in the country, though Begich is up by 4.6 percentage points in the RealClearPolitics average of recent polls.