Entrepreneurs and other tech industry leaders are sending Donald Trump a message: Do not withdraw the United States from the Paris climate agreement.

The president is expected to announce his decision on Thursday but early reports indicate he's leaning toward an exit. The accord, established in 2015 and signed by 195 countries, is aimed lowering global warming emissions, slowing rising temperatures, and helping nations deal with the effects of climate change.

Apple CEO Tim Cook called the White House Tuesday, urging Trump to keep the U.S. in the agreement, Bloomberg News reported, citing "a person familiar with the move." Tesla founder Elon Musk tweeted on Wednesday that he's advised the president to remain, and said he'd quit his position on the White House advisory council if Trump doesn't do so.

Salesforce CEO Marc Benioff also tweeted about the Paris agreement and included a picture of a letter signed by 23 other prominent companies including Facebook, Google, and Microsoft. That letter first appeared as a full-age advertisement in The New York Times in May.

Silicon Valley leaders aren't the only ones urging the president to remain in the agreement: U.S. Energy secretary Rick Perry wants Trump to "renegotiate" the Paris deal, 13 House Republicans signed a letter encouraging the president to stay, and even Trump's daughter Ivanka has warned the president in private that leaving could cause diplomatic blowback, according to The New York Times.

The U.S. is the world's largest economy and second-largest greenhouse gas polluter. A U.S. exit wouldn't dissolve the Paris accord, but could encourage other countries that reluctantly joined to withdraw.