The regional television provider for the Boston Red Sox said it pulled an ad from U.S. Senate candidate Graham Platner’s campaign criticizing the team’s owners over the spot’s “unauthorized use” of copyrighted material.

Platner, the Sullivan oysterman and presumptive Democratic nominee to face U.S. Sen. Susan Collins, R-Maine, in November, spoke during the 15-second spot about how private equity has “destroyed our favorite baseball team, stripping them for parts.”

“Private equity is buying up our homes, our sports and our lives,” Platner said, with the ad citing a 2021 article from Axios on Red Sox principal owner John Henry selling a stake in the team to a private equity firm. “I will reverse the private equity curse. I’m Graham Platner and I approve this message because I miss Mookie Betts.” (Betts was infamously traded by the Red Sox to the Dodgers in 2020 for pennies on the dollar.)

The ad aired during part of Friday night’s game between the Red Sox and the Minnesota Twins. However, Platner wrote on social media Saturday that the New England Sports Network, which is the team’s broadcaster and is partly owned by the Rex Sox, pulled it midway through the game.

NESN said in a statement to various news outlets that the ad “included unauthorized use of third-party intellectual property and did not comply with NESN’s advertising standards.” It did not specify which parts of the ad included the copyrighted material, though Platner’s spot included red text that resembled the Red Sox font.

Platner argued in his Saturday post that the team and broadcaster pulled the ad because it was “exposing how private equity is making everything in our lives worse.” He also alluded to the Twins winning, 8-6.

“And of course, the Red Sox blew a 4-0 lead to lose the game,” Platner wrote.