Jury selection begins today in Denver.
Mueller also sued Swift for two counts of slander, but a judge threw out those claims because the statute of limitations had passed.
The case David Mueller filed back in 2015 stated that he had lost his income because of Taylor Swift's claims and that she and her mother bullied his former employers into firing him.
Swift is seeking a verdict that awards her $1, while holding Mueller responsible and "serving as an example to other women who may resist publicly reliving similar outrageous and humiliating acts", her lawsuit says.
Ex-DJ David Mueller already has been sanctioned for destroying evidence.
The trial is taking place in the U.S. District Court in Denver, Colorado, as the claim is over $75,000 and Swift and Mueller live in different parts of the country.
He claims he was sacked after Swift falsely accused him of grabbing her and he is seeking up to $3 million in damages. She tried to keep the situation "discreet and quiet and confidential" and was upset by Mueller's claim that "for some reason she might have some incentive to actually fabricate this story", her attorney, Douglas Baldridge, has argued in court.
One juror was dismissed over his answer tom the question, "In a lawsuit between David Mueller and Taylor Swift would you have bias for or against either Taylor Swift or David Mueller?" The pair met Swift during a backstage meet and greet.
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"He took his hand and put it up my dress and grabbed onto my ass cheek, and no matter how much I scooted over, it was still there", Swift said in court documents.
Swift's business manager, Jesse Schaudies Jr., said her side did not want the picture in the news.
An alleged photo of the incident, later obtained by TMZ, appears to show Mueller's hand in that area of her body. "I've never been so sure of anything in my life". Here she is seen with him and another DJ Shannon Melcher at the shoot where the alleged incident occurred.
Swift countersued, alleging sexual assault by Mueller.
Mr. Mueller, who is scheduled to testify, has repeatedly denied groping Ms.
- Greg Dent, Swift's bodyguard, may be called to testify about what he saw during the encounter.
As a result, Swift and her attorneys won a big pre-trial victory over Mueller.
Members of the public can line up to watch proceedings from an overflow room in the courthouse, but so far there hasn't been a big turnout.
Immediately after the meet-and-greet, Swift says, she confirmed the assault with a photographer and security staff, who then confronted Mueller.