Update: Elon Musk said in a tweet today that the American Enterprise Institute meeting was not secretive and that he was not there to talk about Trump.

The AEI meeting wasn't secret and I was only there for a few hours to talk about Mars and sustainable energy. Nothing to do with Trump. — Elon Musk (@elonmusk) March 9, 2016

According to a report from the Huffington Post, Elon Musk was among a handful of tech CEOs and Republican establishment members who recently met at the American Enterprise Institute’s World Forum to discuss how to best stop Donald Trump.

According to the report, the meeting took place off the coast of Georgia at a private island resort and included Tim Cook, Google co-founder Larry Page, Sean Parker, and Elon Musk. Other establishment attendees included Mitch McConnell, Karl Rove, House Speaker Paul Ryan, Tom Cotton, Cory Gardner, Tim Scott, Rob Portman, and Ben Sasse.

The event was closed to the press, so exact details aren’t entirely clear, but the report says that the “main topic” was stopping Donald Trump from getting the Republican nomination. How Trump even ended up as the front-runner was also a topic of discussion, the report claims.

Karl Rove gave a presentation at the event during which he discussed the weaknesses of Trump, the primary of which, he claimed, is that voters “have a very hard time envisioning him as presidential.”

Elon Musk has said in the past that he’s not the biggest fan of Donald Trump. Speaking at Vanity Fair’s New Establishment Summit last October, Musk explained that while he tries to stay out of politics, he hopes Trump doesn’t get the nomination (via Mashable). It was also revealed that Musk donated to Democratic candidate Hillary Clinton.

Despite saying he gets involved in politics “as little as possible,” Musk did say he really doesn’t want Trump to get the Republican nomination. “I don’t really have strong feelings except that hopefully Trump doesn’t get the nomination of the Republican party.”

Trump has been critical of environmental issues in the past, as well. Part of his campaign is that he will cut the Environmental Protection Agency in order to give tax breaks, despite the fact that the agency’s budget is relatively small and shrinking . At one point, Trump also said that President Obama’s electric car sales goals are a waste of Americans money.

Obama’s goal of 1 million electric car sales is a little off, by over 910,000 http://t.co/qIHVtjEHiz $100B of our money wasted! — Donald J. Trump (@realDonaldTrump) May 2, 2013

He also said once that global warming was created by the Chinese government:

The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive. — Donald J. Trump (@realDonaldTrump) November 6, 2012

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