Alexander Nix may have misled a U.K. probe when he said his company had "never worked for Russia" or used data harvested from millions of Facebook users.
A specialist review of National Geographic's old issues determined that the magazine presented racist and stereotypical content to the world.
Eighteen-year-old Alexa Duran was driving back from a doctor's appointment with her best friend when the bridge crushed her car.
Federal agents and Mexican authorities found 16- year-old Amy Yu and 45-year-old Kevin Esterly in Playa del Carmen on Saturday. They had vanished on March 5.
The firing and Trump's response early Saturday sparked outrage from Democrats and former members of the intelligence community.