Mueller has sued Swift and others, claiming she cost him his job. Bell is a co-defendant.
The case is another variation on the "he said-she said" nature of high-profile sexual assault allegations.
"Mueller has been hurt and wants his good name back and he wants to be fairly compensated for income he lost and ability to earn income in the future", continued McFarland.
Swift's team told KYGO about the incident, and Mueller, then 51, was sacked two days later. The final jury has yet to be selected, but numerous 60 candidates were dismissed for various reasons, including one who said that Swift was being "petty and dishonest".
Swift filed a countersuit in October of 2015, accusing the former morning show host of assault and battery and asking for a jury trial.
While Mueller said in depositions that his damages amount to some $3 million, Taylor Swift wants compensatory, actual and punitive damages in an amount to be proven at trial, but also a verdict that holds Mueller responsible for the alleged assault.
He added: "David Mueller unequivocally denies he touched her inappropriately in anyway".
Swift has countersued, claiming she was sexually assaulted. Swift, however, was described as "stoic" and politely acknowledged fans who came to support her in the courtroom gallery.
After the photo was taken, Mueller testified that Swift shook his hand and that he and Melcher exited the photo booth room and moved along to other areas at the venue.
Her lawyer said in his opening statement at the court in Denver, Colorado, that Mr Mueller had "grabbed her rear end".
"A meet-and-greet is supposed to be a situation where you're thanking people for coming, you're supposed to be welcoming people into your home, which is the arena for that day, and for someone to violate that hospitality in that way, I was completely stunned", Swift said.
Swift's security guards threw Mueller out of the Pepsi Center and told him he was banned for life from Swift concerts.
Wednesday's court proceedings were delayed by a closed evidentiary hearing that lasted almost two hours.
David Mueller is in court with Taylor SwiftWho is David Mueller?
Talking to reporters her lawyer clarified this in his opening statement at Denver in the court.
A trial over both lawsuits began this week.
Mueller is a former radio show host.
The judge has ordered that any schedule of witness testimony not be released, creating a mystery as to when Taylor Swift will take the stand.
Mueller's suit didn't seek a specific monetary amount but an expert retained by the ex-radio host determined that almost $3 million was a fair compensation for damages.
The fashion plate: Swift looked demure, wearing a long-sleeved black shirtdress with plaid trim, sheer black tights, needle-thin heels and a red lip.
Andrea Swift said in wake of the incident, Taylor will no longer perform in the crowd at concerts. This is Taylor's way of showing women that "you can always say no", Douglas added. Had they attended the concert on June 2, 2013, where Swift claims she was groped?
As Mueller testified, Swift sat right in front of the witness box, looking agitated.
Taylor Swift is also expected to take the stand at some point.
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