Joshua Aaron has worked in and around the tech industry for around two decades. He built his first app — a blackjack game — at computer camp when he was 13.

DHS Secretary Kristi Noem said the Trump administration is exploring prosecuting CNN for reporting on an app that alerts users to nearby ICE agents.

The report from CNN’s Clare Duffy on Monday was on the app ICEBlock, featuring an interview with its developer, Joshua Aaron. He said that he created the app after watching Trump’s immigration crackdown, and compared the arrest of suspected undocumented immigrants to what happened in Nazi Germany.