Reports say President Donald Trump will nominate National Security adviser Mike Waltz to become the nation's ambassador to the United Nations.

White House shakeup: Mike Waltz leaves national security role, nominated as UN ambassador Louis Serbeck, 54, died while being rushed to a nearby hospital. A passenger's mobile device was lodged in a seat and caused "an electrical smell," prompting an emergency landing to remove it.

In a surprise move, National Security Adviser Mike Waltz will be leaving the Trump administration. Here's what people are saying.