Sen. Ben Sasse (R-NE) posted "An Open Letter to Trump Supporters" on his official Facebook page that outlined exactly why he will not be supporting Donald Trump this November if he were to be the nominee. He urged conservatives to find a third option to support if Trump were to land the party's nomination.

(Emphasis added)

My current answer for who I would support in a hypothetical matchup between Mr. Trump and Mrs. Clinton is: Neither of them. I sincerely hope we select one of the other GOP candidates, but if Donald Trump ends up as the GOP nominee, conservatives will need to find a third option.

Here's the full post

Sasse was also critical of Trump's use of the term "reign," explaining that Nebraskans are not asking for a person to run for king, but rather a Constitutional Republic. He also expressed concerns about Trump's statements about "open(ing) up libel laws" and censoring journalists who do not agree with him.