I applied online. The process took 3 weeks. I interviewed at National Governors Association (Washington, DC)
Interview
The interview was 3 interviews. It was pretty good however, questions were difficult. The question you should prepare for is "NGA is a bipartisan hub, how do you feel about that?" specifically.
Interview questions [1]
Question 1
What do you look for in a supervisor?
NGA is a bipartisan hub, how do you feel about that?