It is important that you are candid and honest with the interviewer. Share if you have ever been asked to leave a position. If you have been asked to leave a position, explain why and mention any internal organizational changes that were occurring, mergers/acquisitions that were in process, or ongoing performance issues you were struggling with. If performance was the reason, explain what you learned from that situation, and be sure to mention what you have done to ensure you do not struggle with those same performance issues again.