If Trump wins presidency, how many Dem Senators in 2018 lose their seats?

[pikachu]

This is a really silly question to ask since we don't what the circumstances of 2018 would be, especially with a President Trump, whose behavior would likely be extremely erratic at the best of times. With that said, the fundamentals of a midterm election under a Republican president suggest that Dean Heller should be very, very scared, and that Jeff Flake should be a little nervous. There are some Dem seats worth worrying about, and I'd expect Republicans to get a net gain, but under neutral conditions, I can't see it being that large.