He placed a call to Armstrong and Aldrin minutes after their landing (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
nixon
(Other definitions for nixon that I've seen before include "US president, d.1994" , "Thirty seventh US president" , "Disgraced US president" , "37th US President" , "President re-elected in 1972" .)