Washington( CNN) Secretary of State Rex Tillerson celebrates one year in office on Thursday — a modest accomplishment by some criteria, but one his critics had rejected as unreachable just months ago.

Tensions between President Donald Trump and Tillerson seemed to reach a boiling point in October, after NBC reported that Tillerson called his boss “a moron, ” resulting some to theorize his tenure in Foggy Bottom would be short-lived.

But Tillerson, who says he's learning how to better communicate with the President, seems more determined than ever to maintain his post, telling CNN in a recent interview he plans to be there at the end of the year.