Your evidence that Clinton is prepared to use nuclear weapons against Russia pre-emptively?
As for Trump:
“Europe’s a big place,” he said on Fox. “I’m not going to take cards off the table. We have nuclear capability. Now, our capability is going down rapidly because of what we’re doing. It’s in bad shape, the equipment is not properly maintained, there’s a whole lot of talk about that, and that’s a bad thing, not a good thing.”
I don't think there's anything in The Art of the Deal which suggests that having a weapon, making sure it's ready to use, declaring that its use is "on the table" and suggesting that other parties (e.g. Saudi and Japan, but not presumably Iran) could and should have their own nuclear capability, amounts to ruling out the possibility of actually using it. Plus, of course, using nukes against ISIS is a possibility he's suggested - and American nukes would really help sort out the Middle East.
And still there are people who think Clinton a bigger danger!