I watched that part of the interview. I kind of took Trump’s response as Tillerson possibly getting burnt out.
Tillerson disagrees, a month ago;
https://www.youtube.com/watch?v=yRJQ59ZgMq4
“He Never Said Moron!” Heather Nauert Slams CNN Reporter Over Rex Tillerson News Story
https://www.youtube.com/watch?v=CEpeqf0cXv8