Via the Washington Post, the complete quote from Donald Trump calling for the possible assassination of Hillary Clinton:
Hillary wants to abolish, essentially abolish the Second Amendment. By the way, and if she gets to pick — if she gets to pick her judges, nothing you can do, folks. Although the Second Amendment people, maybe there is, I don’t know. But I’ll tell you what, that will be a horrible day. If, if Hillary gets to put her judges — right now we’re tied. You see what’s going on. We’re tied, ’cause Scalia, this was not supposed to happen. Justice Scalia was supposed to be around for ten more years at least, and this is what happens. That was a horrible thing. So now look at it. So Hillary essentially wants to abolish the Second Amendment.
Key phrase: "But I’ll tell you what, that will be a horrible day." That line puts the lie to the notion that this is Trump calling on people to vote, as some of his supporters have suggested. Voting does not result in a "horrible day".
The Secret Service is aware of the comments made earlier this afternoon.— U.S. Secret Service (@SecretService) August 9, 2016