The already high-stakes antitrust battle between the U.S. government and Live Nation took a dramatic turn this week, as the company filed a blistering motion for sanctions accusing rival Anschutz Entertainment Group (AEG) and state prosecutors of engaging in witness intimidation and serious litigation misconduct.

At the center of the dispute is a former AEG employee—described only as “the Witness”—whose testimony Live Nation claims was critical to undermining the government’s entire damages model. Developed by expert economist Dr. Rosa Abrantes-Metz, the model rests on the premise that AXS was a viable, comparable alternative to Ticketmaster.

Most people in the live entertainment industry don’t see AXS and Ticketmaster as equals and Live Nation had called Rick Mueller, who left AEG in 2024 to work at Live Nation, to argue that many promoters at AEG about AXS not working. If AXS was genuinely inferior, the theory that Live Nation's exclusive contracts unlawfully foreclosed competition becomes considerably harder to sustain.

AEG allegedly dug up dirt on Mueller to tried to pressure him not to testify, Live Nation attorneys argued, handing over his personnel file to lawyers for the state plaintiffs as part of an attempt to prevent him from testifying at all.

The accusations, if taken seriously by the court, could reshape not just the trajectory of the trial—but also how the jury interprets key evidence about competition in the ticketing market.

Live Nation’s motion hinges on a sequence of events that unfolded in the days leading up to Mueller’s scheduled testimony in late March.

According to the filing, AEG’s outside counsel voluntarily handed over a trove of confidential and highly personal information about Mueller to government lawyers—well after discovery had closed and without any subpoena or formal request.

More troubling, Live Nation alleges that AEG didn’t just provide the information—it suggested how it might be used.

In an email cited in the motion, AEG’s lawyer reportedly told plaintiffs: “We think there is a good chance he would try to avoid testifying if he knew this would come up.”

Live Nation says that statement is smoking gun evidence of an effort to intimidate him into staying off the stand.

On the eve of the Witness’s testimony, government lawyers allegedly threatened to use the confidential information in open court unless Mueller agreed to characterize his departure from AEG as termination for “misconduct.”

A temporary compromise was reached on how the issue would be handled. But according to Live Nation, that deal fell apart hours later—after “other people” within the plaintiffs’ camp intervened and pressured one of the state’s attorneys to renege on an agreement with Live Nation over how the confidential information could be used, forcing Live Nation to alert the court.

The judge ultimately stepped in, enforcing the original agreement and limiting how the information could be used during testimony. But by then, the damage—at least from Live Nation’s perspective—had already been done.

This isn’t just procedural drama. The fight over this one witness goes to the heart of the government’s case.

A key pillar of the plaintiffs’ argument is that AEG’s ticketing platform, AXS, is a viable competitor to Ticketmaster—undermining Live Nation’s claim that its market position is driven by product quality rather than anti-competitive conduct.

But Mueller, according to Live Nation, was set to share emails of AEG promoters expressing deep contempt for AXS. As we reported last week, that includes emails of John Moore with Bowery Presents calling AXS “the worst ticketing service, pathetic.”

Other AEG emails described AXS in even more brutal terms—“the worst ticketing service,” “a horrible burden,” and “#3 in a two-horse race.”

Live Nation argues that this testimony—and the documents backing it up—would directly contradict the plaintiffs’ economic model, which assumes AXS is comparable in quality to Ticketmaster. (Spoiler alert: it’s not)

In other words, if AXS isn’t truly competitive, the government’s theory of harm starts to unravel.That, Live Nation suggests, is why AEG and the plaintiffs were so motivated to sideline Mueller.

The motion doesn’t stop at accusations of gamesmanship. It alleges a cascade of potential legal and ethical violations.

Among them:

Perhaps most strikingly, Live Nation argues that even if the effort failed, the attempt itself is sanctionable.

“This blatant attempt to dissuade a witness from providing truthful testimony through intimidation is intolerable,” the company writes.

As a remedy, Live Nation is asking the court to impose sanctions that would directly affect how the jury evaluates the case.

Specifically, the company wants the judge to admit certain AEG documents about AXS quality as substantive evidence and expand how previously admitted evidence against AXS can be used. Live Nation lawyers also want the judge to instruct the jury that plaintiffs and AEG coordinated closely—and improperly attempted to influence the Mueller. Live Nation attorneys hope a jury instruction suggesting misconduct or fear of unfavorable evidence could severely damage the credibility of the plaintiffs’ case.

The sanctions motion effectively creates a “trial within the trial,” shifting attention from market definition and exclusivity contracts to questions of legal ethics and litigation conduct.

It also underscores how central AEG has become to the case—not just as a competitor, but as an active behind-the-scenes player working in lock-step with the DOJ and the states attorney generals. Its own CEO, Jay Marciano, told staff in a 2024 memo that Ticketmaster held a monopoly and used it to impose its will on the industry.

Live Nation argue AEG is not a victim in this case but acts as a self-interested rival that has been pushing for a breakup of its biggest competitor while coordinating closely with regulators.

Whether the court buys that framing remains to be seen.