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 witness intimidation and serious litigation misconduct.

AEG and the plaintiffs have both filed motions in opposition.

At the center of the dispute is Live Nation executive Rick Mueller, who spent more than a decade at AEG before joining Live Nation in 2024. Mueller was called by the defense to testify—apparently to criticize the quality of AEG’s ticketing platform, AXS, compared to Ticketmaster. If AXS is genuinely inferior, the theory that Live Nation’s exclusive contracts unlawfully foreclosed competition becomes harder to sustain.

Sensing an opening, the plaintiffs—the state attorneys general who took over after the DOJ stepped back—sought to impeach Mueller over potential bias. They quietly asked AEG for documents related to his departure from the company.

AEG provided them.

Live Nation claims AEG effectively dug up damaging information to pressure Mueller not to testify. AEG sharply disputes that characterization, arguing Live Nation is trying to shift blame and insisting nothing it did was unlawful.

If the court takes the allegations seriously, the dispute could reshape not only the trajectory of the trial but also how the jury views key evidence about competition in the ticketing market.

Live Nation’s motion centers on events in the days leading up to Mueller’s late-March testimony.

According to the filing, AEG’s outside counsel voluntarily handed over confidential personnel records about Mueller—including details about his departure—after discovery had closed and without a subpoena or formal request.

More troubling, Live Nation alleges AEG suggested how the information might be used.

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

Live Nation calls that statement a smoking gun—evidence of an effort to intimidate Mueller into staying off the stand. AEG counters that the remark merely stated the obvious, calling Live Nation’s claims “both absurd and reckless.”

On the eve of Mueller’s testimony, the parties reached a temporary compromise: he would be asked a single question about his exit from AEG, allowing the jury to weigh any potential bias.

According to Live Nation, that agreement unraveled hours later after “other people” within the plaintiffs’ camp pressured a state attorney to backtrack—forcing Live Nation to alert the court.

The judge ultimately enforced the original agreement and limited how the information could be used. But by then, Live Nation argues, the damage had been done.

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

Mueller’s testimony cuts directly against that argument.

According to Live Nation, he was prepared to share internal emails from AEG promoters sharply criticizing AXS. As previously reported, that includes a message from Bowery Presents executive John Moore calling AXS “the worst ticketing service, pathetic.”

Other emails described the platform as “a horrible burden” and “#3 in a two-horse race.”

Live Nation argues this evidence undercuts the plaintiffs’ economic model, which assumes AXS is comparable in quality to Ticketmaster. If that assumption fails, the government’s theory of harm begins to unravel.

That, Live Nation suggests, explains the effort to sideline Mueller.

The motion accuses AEG and the plaintiffs of a range of potential violations, including:

Live Nation argues that even a failed attempt to influence testimony is sanctionable.

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

AEG rejects the allegations outright.

In a statement, the company said it provided materials at the request of state attorneys general “to assist them in obtaining truthful and accurate information” during cross-examination. It called the intimidation claim “categorically untrue” and “the height of hypocrisy,” arguing Live Nation has itself relied on aggressive tactics to maintain dominance.

“It’s worth noting,” AEG added, “this remains a Live Nation antitrust case, not a Live Nation v. AEG one.”

In a 27-page filing, AEG’s attorneys accuse Live Nation of “flagrant misrepresentations” and attempting to inject “abject falsehoods” into the record.

Lawyer Justin Bernick wrote that Live Nation is seeking a jury instruction based on a false premise—that plaintiffs improperly tried to dissuade Mueller from testifying. Such claims, he argued, are themselves ethical breaches.

AEG’s brief is especially forceful on the witness tampering allegation, noting that federal law excludes conduct intended to encourage truthful testimony. Providing documents to ensure accuracy, the company argues, does not constitute intimidation.

If the goal had been to deter Mueller, AEG adds, someone would have informed him directly and used the documents as leverage. That never happened. Mueller knew questions might arise and testified anyway.

Live Nation is seeking sanctions that would directly shape how the jury evaluates the case.

Specifically, it wants the court to admit additional AEG documents about AXS as substantive evidence, expand the use of existing evidence, and instruct the jury that AEG and the plaintiffs improperly coordinated to influence Mueller.

Such an instruction—suggesting misconduct driven by fear of damaging testimony—could significantly undermine the plaintiffs’ credibility.

The sanctions fight has created a “trial within the trial,” shifting focus from market definition and exclusivity contracts to legal ethics and litigation conduct.

It also highlights AEG’s growing role—not just as a competitor, but as an active participant working alongside regulators. In a 2024 memo, CEO Jay Marciano told staff that Ticketmaster held a monopoly and imposed its will on the industry.

Live Nation, for its part, argues AEG is a self-interested rival pushing for its breakup while coordinating closely with regulators.

Whether the court accepts that framing remains to be seen. Judge Subramanian is expected to rule on the sanctions motion as early as this week.