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.

National security adviser Mike Waltz is leaving his White House post, although soon after reports about his departure were published, President Trump announced he plans to nominate him to be ambassador to the United Nations.

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