"While checking into a flight from AMS headed to USA, I was told as a prerequisite to getting my boarding pass I needed to talk to an agent from the US Departme

"While checking into a flight from AMS headed to USA, I was told as a prerequisite to getting my boarding pass I needed to talk to an agent from the US Department of the State. He asked me many detailed questions about my travels and said I was considered a person of interest. He stressed that they may in the future not allow me to enter the USA (I'm a citizen of USA)." I recently flew from Zurich home to San Francisco and prior to boarding the plane in Zurich I was interviewed by a state department employee. She was very nice and at no time indicated that I was special or "of interest", etc. She did, however, drill pretty deeply into where I had been and what I was doing. I have traveled to Switzerland relatively frequently over the past ten years and this was the first time I had seen this.