Over 400 business leaders have signed a letter defending the Deferred Action for Childhood Arrivals (DACA) program.

The original signatories of the letter include the CEOs of Alphabet (GOOGL - Get Report) , Amazon (AMZN - Get Report) , Apple (APPL) , Microsoft (MSFT - Get Report) & Facebook (FB - Get Report) , with the CEOS of AT&T (T - Get Report) , Best Buy (BBY - Get Report) & Wells Fargo (WFC - Get Report) adding their names on Monday.

The letter stated "Dreamers are vital to the future of our companies and our economy. With them, we grow and create jobs. They are part of why we will continue to have a global competitive advantage.""

A number of CEOs also tweeted their support for Dreamers, including Pearson's (PSO) John Fallon, Apple's Tim Cook, ADL-CIO's Jonathan Greenblatt and Salesforce's (CRM - Get Report) Marc Benioff.

Watch More with TheStreet: