Violation of my rights under FMLA

On June 13 of this year, I returned to work from FMLA. Before I took FMLA, I trained another employee on my job. When I returned, my manager said she wanted to keep my co-worker in my former position. She said there were gaps in my director’s organization that I could fill. When I was on leave, my manager and her team moved under a new director who I only met twice before leave. There was one job opened under my director. It wasn’t a role that I really wanted but I told my manager I would take it. She asked if I was sure I wanted it and I said “Yes, because I don’t want to get laid off and I hear there are lay off’s coming.” My director said I could have the job and I started training for it immediately. For the past 4 weeks, I have been training for this position. I was to start this job full time on August 1. On August 2, I was laid off. I was told the layoffs were not performance based but business need based. I feel they violated my rights under FMLA. The person I trained in my old position was not laid off and my old job is still there. The employee who is working in the position I was training for was not laid off and that job is still there.
What are my rights?

Jennifer