Key witness testifies in Taylor Swift groping trial

The former girlfriend of David Mueller, who is accused of groping Taylor Swift, testified she didn't see Mueller do anything wrong.
1:49 | 08/12/17

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Transcript for Key witness testifies in Taylor Swift groping trial
But first a judge dismissing a former deejay's lawsuit saying there wasn't enough evidence against the superstar. But the case isn't over yet and ABC's Clayton Sandell has more on the he side/she said battle about alleged groping during a photo-op. Reporter: This morning, Taylor Swift shaking off a major lawsuit. I couldn't be more proud to represent somebody like Taylor Swift. Reporter: A federal judge throwing out a case filed by former radio deejay David Mueller. So for team swift huge victory. Huge. Reporter: He allegedly grabbed her bare backside at a meet and greet in 2013 captured in this photo leaked to TMZ. She says. Swift complained and he was fired and Mueller sued her, her mother and -- I think in terms of the standard that the court has to look at. Mueller's waist was weak. Reporter: The judge is letting part of his lawsuit against her mother and manager go forward. But so will the countersuit that swift filed accusing Mueller of assault and battery. She's been assertive and I think her fans and women all over the country will applaud her for standing her ground. Reporter: Also an Friday Mueller's ex-I recallgendz Shannon Melzer said she didn't see him do anything wrong. Ryan was his longtime radio partner and friend. I believe he's innocent and I'm here to do everything I can to defend him. Reporter: Mueller has always claimed there was no inappropriate touching. Monday closing arguments then a jury of two men and signature women will decide. For "Good morning America," Clayton Sandell, ABC news,

This transcript has been automatically generated and may not be 100% accurate.

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