Metselaar says that ending DACA will cost the U.S. $433.4 billion in GDP lost and will also affect hundreds of thousands of hard-working Americans.

One of those Americans is his employee and DACA recipient Ilknur Eren, 25.

Eren, who works as an executive assistant to the company’s CFO, came to the U.S. from Turkey when she was just nine years old, she tells CNBC Make It.

“It was not my conscious decision,” she says. “I was nine. I couldn’t even decide what to eat for dinner.”

Because she was not a U.S. citizen she was ineligible for most federal aid, loans and scholarships during her undergraduate career.

However, when Obama signed DACA into law in 2012, she applied for the program, went through the strenuous vetting process and paid a fee to be protected as an undocumented immigrant. “I knew that it would open up a lot of opportunities and a lot of doors,” says Eren.

But in six months, she may lose all of that and the country that she called home for most of her life. “I am more accustomed to the American culture than the Turkish culture,” she says. “I’m an American, just without the paperwork.”

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Metselaar describes Eren and other dreamers that he has come across as incredibly bright and dedicated. “They are all contributing more than immigrant parents from one or two generations ago,” he says.

In New York, 5 percent of the state’s population consists of undocumented immigrants, Metselaar says in a Crain’s op-ed. That amounts to over 45,000 employees who will be removed from the workforce. In total, they earn over $18.3 billion annually and pay $1 billion in state and local taxes and $1.6 billion in federal taxes, he says. This leaves $15.8 billion in remaining spending power.

Ending DACA “will have a ripple effect on the economy,” Metselaar tells CNBC Make It. “It will put a chill on people coming in from other countries. We will lose opportunities, which is tragic from a business perspective.”

He points to Sergey Brin, the Russian-born co-founder of Apple. “Can you imagine if someone like him was not allowed to enter the country?” says Metselaar. “This is the antithesis to job creation. Immigrants are not taking jobs. They are the entrepreneurs.”

The White House’s decision has been met with sharp criticism from a number of CEOs, including Apple’s Tim Cook and Facebook’s Mark Zuckerberg.

Metselaar says that the announcement has been discouraging for people like him who manage global businesses and for those who benefit from DACA.

“The company stands to lose a stellar employee. Now magnify that by 800,000,” he says. Metselaar adds that business leaders must lobby Congress to either preserve the DACA program or pass bipartisan immigration reform. In the meantime, he says: “We will do everything within the boundaries of the law to support and protect [Eren].”

Eren says that she felt “devastated,” when she heard that DACA was ending. Yet she remains optimistic that Congress will implement a plan that will allow her to stay in the country.

“I’m still very hopeful that [dreamers] will get to stay in the only country we have ever called home and contribute to our communities,” she says. “I have aspirations and goals. I won’t let this announcement stop me from achieving them.”

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See also:

A ‘dreamer’ opens up about life under Trump

Why these 8 CEOs are standing up for ‘dreamers’

These 5 tech CEOs are not happy with Donald Trump’s travel ban