The Treasury Department on Thursday launched an app for managing Trump Accounts, a new investment account for children in the U.S. that has sparked criticism from experts who argue the program will fail to help financially vulnerable kids.

Nearly 6 million children have signed up for the investment accounts.

The Trump Accounts app—designed in partnership with Bank of New York Mellon and Robinhood—launched on Thursday on Apple and Google app stores, the Treasury Department announced, noting the app will be the “main interface” for the program.

The app sign-in process requires the email address used to apply for a Trump Account, a phone number and a password, after which users are reportedly met with a screen that reads, “Stay tuned for an invite.”

Trump Accounts will be rolled out in phases, according to the app, which said it will send an email invite to activate the account.