Full-page anti-Elon Musk advertisements appeared the Sunday editions of the Washington Post and The New York Times.
Both of the ads urged Musk, who is the CEO of Tesla, to "dump Trump." In other words, no longer serve on President Donald Trump's business advisory council.
Musk, however, has previously said his position on the council doesn't mean that he agrees with the administration's actions.
Startup investor Doug Derwin told CNNMoney he shelled out $400,000 to run ads in both of the popular national newspapers as well as the San Francisco Chronicle and the San Jose Mercury News.
The advertisements are Derwin's latest attempt to convince Musk he's not helping the cause of environmentalists.
"You've said climate change is one of the most important issues facing mankind," the full-page ad reads. "Donald Trump is a disaster for the fight against climate change."
In a statement to CNNMoney, Tesla fired back saying it is "ironic" that the ad attacked Musk regarding environmental issues.
"Tesla's entire reason for existing is to accelerate the advent of sustainable energy," the statement to CNNMoney said.
Derwin said if Musk starts speaking up, he's ready to donate $1 million to the charity of the Tesla CEO's choice.