The communications app TeleMessage, which was spotted on former US national security adviser Mike Waltz's phone, has suspended “all services” as it investigates reports of at least one breach.

Message contents and government official contact information were obtained during the breach, 404 Media reports.

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.