Amazingly, voters would not have been able to use that argument two years ago, as they are presumably not time travelers. Also, do you really think President Ted Cruz would not have nominated someone like Gorsuch or endorsed legislation that appealed to conservative voters?
The funny thing is that politicians say a lot of things and don't follow up with it so no I can't guarantee that Cruz would have done it.
You said 'have' meeting a decision that happens in the present so I interpreted it as an indictment of the support for Trump currently.