Victoria Meijia Garcia, 31, opened the CBP One app at 10 a.m. Monday as she did every day for the past several months, seeking an available appointment with an asylum official. But today, the top of the familiar homepage blared a message that filled her with dismay.

The CBP One app has been wildly popular. It is an online lottery system to give appointments to 1,450 people a day at eight border crossings.

The American Dream has come crashing down for millions and millions of people who line up to get a chance to settle in the United States. Donald Trump has, with one signature, shut the door for them permanently.

From one order tackling the definition of birthright citizenship, to another declaring illegal immigration at the border a national emergency, Trump swiftly made moves on his promises to tighten the US-Mexico border.