Can I sue corporation or VP?

I had to hound my regional VP to get after hours pay for months. Right after this he informed me that there had been hostile work environment claims made against me and an investigator would contact me. After my site medical director was made aware of this claim, he asked me if knew about it. The VP told him the claim was made the clinic nurse. I have the emails between these two. The clinic nurse said investigator called her. She told investigator she never made this claim and doesn't know where it came from. Investigator said to her if we just forget about this can things go back to the way they were. Investigator called me and never mentioned the claim. Was questioning several issues that had been reported by me to administration. Now, they are trying to find any reason possible to terminate me. Can I sue the VP or the company?