A hacker managed to breach TeleMessage, a company that sells a modified version of Signal to the US government. Mike Waltz was spotted using it last week.

In a continuation of Signalgate, Hegsgeth came under scrutiny again last month, when the Washington Post reported that he not only had Signal installed on his phone, but that he also used a so-called unsecured internet line to bypass Pentagon security and install Signal on a desktop computer.

President Donald Trump has gone through his share of national security advisers. But he doesn't hold the record, yet.