Famously the President that helped create it, Truman, did. He told his biographer, Merle Miller
I think [creation of the CIA] was a mistake. And if I'd know what was going to happen, I never would have done it.
Now, as nearly as I can make out, those fellows in the CIA don't just report on wars and the like, they go out and make their own, and there's nobody to keep track of what they're up to. They spend billions of dollars on stirring up trouble so they'll have something to report on. They've become ... it's become a government all of its own and all secret. They don't have to account to anybody.
In addition, Trump plans or hopes to reduce the size of the CIA. The WSJ article that broke the story is better but is behind a paywall.