Thune also says that he'll vote for Trump if he's on the ballot:
http://abcnews.go.com/Politics/republican-senators-urged-donald-trump-step-support/story?id=42748881
The story portrays this as a "reversal" for Thune and Fischer. But again, the media sees it this way because they weren't properly parsing Fischer's and Thune's statements over the weekend. They both said that Trump should drop out, because the party would be better off with Pence leading the ticket. But they never said they would defect to Clinton or 3rd party if Trump refuses to go.
Yeah, normally calling on a candidate to drop out would be safe to equate as withdrawing your endorsement, but this being 2016, the regular rules are out the window.
Looking forward to the first Republican to acknowledge that while yes, he would vote for Satan over Trump, he will vote for Trump over Clinton.