Former California Gov. Arnold Schwarzenegger (R) on Monday went after President TrumpDonald John TrumpTrump renews attacks against Tester over VA nominee on eve of Montana rally Trump submits 2017 federal income tax returns Corker: Trump administration 'clamped down' on Saudi intel, canceled briefing MORE’s decision to withdraw from the Paris climate agreement, biking to the French capital's city hall to discuss the issue with the mayor.

Photos and videos posted online show Schwarzenegger waving and grinning as he rides on a green bike, wearing a green tie.

The action movie star spoke at an event focused on climate change that was hosted by R20, a nonprofit he co-founded.

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“It doesn’t matter that Donald Trump backed out of the Paris agreement, because the private sector didn’t drop out, the public sector didn’t drop out, the universities didn’t drop out, the scientists didn’t drop out, the engineers didn’t drop out. … No one else dropped out,” Schwarzenegger said, according to the Los Angeles Times.

Trump in June announced that the United States would withdraw from the Paris climate agreement, calling it “unfair at the highest level.” The decision placed the U.S. at odds with the rest of the world — every other country has signed on to the agreement.

Schwarzenegger has emerged as a prominent voice on the subject of climate change. In 2011 he founded R20, an international organization with backing from the United Nations that works to fund green infrastructure efforts.

“Donald Trump pulled Donald Trump out of the Paris agreement, so don’t worry about that,” Schwarzenegger reportedly said in France. “We at a sub-national level are going to pick up the slack and continue on. We will fight and we will create the kind of future for our children and grandchildren because that is our responsibility and no one will stop us.”