ABC News’ chief Washington correspondent Jonathan Karl recently thanked Dr. Anthony Fauci for his service and said that he thinks Fauci is among the “hardest working” people in the U.S.

Fauci has been a prominent public health figure throughout the COVID-19 pandemic.

Karl noted that Fauci will turn 81-years-old on December 24 and asked whether he feels a responsibility to continue working until the situation is under control.