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Beach Boys founding members Brian Wilson and Al Jardine alerted fans Monday that they have no part in an appearance later this week by a version of the group fronted by cofounder Mike Love at a trophy-hunting convention where Donald Trump Jr. will be the keynote speaker.

Love’s touring edition of the Beach Boys, for which he holds the legal rights to the name, also includes longtime band member Bruce Johnston. They are slated to play Wednesday, Feb. 5, at the Safari Club International Convention in Reno, where hunting enthusiasts can arrange trips to hunt exotic animals. Trump Jr. and his brother, Eric, are longtime trophy-hunting supporters.

“This organization supports trophy hunting, which both Al and I are emphatically opposed to,” Wilson tweeted on Monday. “There’s nothing we can do personally to stop the show, so please join us in signing the petition” protesting the private event at Change.org.

As of early afternoon Monday, the petition had surpassed 60,000 signatures toward a stated goal of 75,000 signees.

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