President Donald Trump is expected on Friday to eliminate the Deferred Action for Childhood Arrivals (DACA), which prevents the deportation of undocumented workers who arrived in the U.S. as children.

"These young people represent the future of our country and our economy," Mark Zuckerberg wrote in a Facebook post on Thursday. "They are our friends and family, students, and young leaders in our communities."

The Facebook co-founder and CEO joined a long list of business leaders standing against the president's latest controversial decision. DACA allows about 800,000 immigrants who were brought to the U.S. illegally as children to stay and work in the country. To qualify, applicants must have entered America before the age of 16, lived in the U.S. continuously since June 2007, and have committed no serious crimes.

"As a CEO, I see each day the direct contributions that talented employees from around the world bring to our company, our customers and to the broader economy," Microsoft CEO Satya Nadella wrote in a LinkedIn post on Thursday. "We will always stand for diversity and economic opportunity for everyone," wrote Nadella, adding that he himself is an immigrant who was allowed to come to the U.S. to "pursue my dreams."

Uber also issued a statement on Thursday. While that appeal wasn't signed by a specific person, it comes days after the company appointed Iranian-born Dara Khosrowshahi to become its new CEO and lead the company to a possible IPO in several years. "Dreamers grew up here, live here, and are contributing to our communities and our economy," the statement read. "Their contributions make America more competitive and they deserve the opportunity to work, study, and pursue the American dream."

What's more, Apple's Tim Cook, Amazon's Jeff Bezos, Warren Buffett, and about 350 other executives of major U.S. businesses signed a joint letter asking Trump to keep DACA in place. The letter was penned by the immigration reform group

Silicon Valley has been churning out statements that either disagree with the president's actions or implore him to change his mind. So far this year, entrepreneurs have fought against Trump as he tried to ban refugees from Muslim-majority countries, cancel a "startup visa" that would make it easier for skilled entrepreneurs to work in the U.S. and reduce the number of green cards the government issues to foreigners.