It's not hard to produce evidence of this. What is hard is getting it on television where people can see it.
Hopefully Hillary’s attempt to revive the birther issue and smear Trump with it will die down after a day or two. But if Trump supporters are ever to present evidence that the Hillary campaign of 2008 originated the issue, it will have to be reduced to a few sentences, or a video or some brief articles from 2007 or 2007. Few will read multiple and lengthy articles that go round and round and are hard to follow due to their length.
But maybe it will all die down this week.