Following this comment, ICEBlock grew in popularity overnight, bringing it to the top of the App Store on Tuesday before dropping to the third spot at the time of writing. According to its website, ICEBlock lets users report sightings of ICE officials with “two taps” and view reports that others have made within a five-mile radius.

ICEBlock's rapid rise in popularity followed a wave of criticism from senior officials in the Trump administration. Homeland Security Secretary Kristi Noem responded to a CNN

The Trump administration is blasting a new app designed to warn people about the presence of immigration officers in their vicinity. The administration is threatening to prosecute the app developer and a media outlet for reporting on it.