The app, set to launch in January, allows illegal immigrants to alert family members and the nearest Mexican consulate if they are about to be detained by US authorities. Mexico is creating an app, "Alert Button," to support Mexican nationals in the US facing potential deportation, a senior Mexican official announced Friday. The app, set to launch in January, allows illegal immigrants to alert family members and the nearest Mexican consulate if they are about to be detained by US authorities. "In case you find yourself in a situation where detention is imminent, you push the alert button, and that...