 The shooter was spotted by local law enforcement who thought he might have been acting suspiciously near the event magnetometers on Saturday, according to a senior law enforcement official. They put her out over the radio to keep an eye on him, and that information was passed on to the Secret Service as well. So already we can say definitively that if the Secret Service did their job, that would have been the end of it. Anybody watching this would be assassined, would have immediately noticed when he scaled a building, armed with a rifle, and Trump would have been taken to safety right away.