This GOP senator is the first to say he won't vote for Donald Trump in November

On Sunday, Donald Trump got his first endorsement from a sitting U.S. senator, Jeff Sessions (Ala.), in a blow to GOP presidential rival Sen. Ted Cruz (Texas) — but he also received his first un-endorsement, when Nebraska Sen. Ben Sasse (R) said on Twitter he won't support Donald Trump (or Hillary Clinton).

The tweet was the first in a Twitter "open letter to my friends supporting Donald Trump," and in follow-up tweets he explained why he won't back the probable nominee of his political party, starting with whom he would support: "My expectation is that I'll look for some 3rd candidate — a conservative option, a Constitutionalist." He accused Trump of not supporting the First Amendment ("threats vs religious liberty") and said "a presidential candidate who boasts of what he'll do during his 'reign' & refuses to condemn the KKK cannot lead the conservative movement." Then Twitter responded, and Sasse felt compelled to say he's a conservative, not a "career politician," wants to make America great again, is "not part of the Establishment," and "is not for open borders." You can read Sasse's "open letter," interrupted by an Oscars complaint, at Twitter.

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