Last week, the Justice Department and the FBI abruptly walked back the notion that there's an Epstein client list of elites who participated in the wealthy New York financier's trafficking of underage girls.

Months after the chat was disclosed, questions remain over the controversy, including if federal laws were violated and if classified information was exposed on the commercial messaging app.

Mike Waltz, Trump's former national security adviser, faced questions from Democrats on the Signal chat controversy Tuesday in confirmation hearing for U.N. ambassador.