It was very short, about 20 minutes. They specifically asked me why I wanted to work for the administration and how it tied in with my background. I made sure to discuss specific policy initiatives that were interesting to me

In order for you to intern at the Office of Science and Technology Policy you need to apply through the OSTP website, the process is lengthy since it will take some time for the office to contact you. During the interview process the interviewer will ask for your prefer division to work on. I recommend to study the divisions and the work policy work each one does.