From the March 1990 Playboy interview with Donald Trump:

Playboy: How is your marriage?

Trump: Just fine. Ivana is a very kind and good woman. I also think she has the instincts and drive of a good manager. She's focused and she's a perfectionist.

Playboy: And as a wife, not a manager?

Trump: I never comment on romance.... She's a great mother, a good woman who does a good job.

Playboy: What is marriage to you? Is it monogamous?

Trump: I don't have to answer that. I never speak about my wife--which is one of the advantages of not being a politician. My marriage is and should be a personal thing.