I had to research this as it is the first I heard of it. Best comment I found below:
“So in summary, it does read like Donald Trump did want to explore ways to help out the Club for Growth and their initiatives, but on the other hand, the Club for Growth basically says that even though they really don’t like Trump, they can be bought for $1,000,000.”
And Trump said he was funding his OWN campaign, he doesn’t want to be owned by any one other than the American People...