Whenever there is a huge power mismatch in a relationship - that is generally not a situation where you can't say someone is not coerced in any way. Especially when the person in question is the president of the United States!
I don't know, I have somewhat different thinking about sex in professional settings. I tend to see women as more capable of using their own judgement in those situations and less needing of protection. That's not always the case though, like with Harvey Weinstein.
Edit: comment if you disagree, downvotes won't change my opinion.