I was thinking of things like the Iran-Contra affair, for starters.

Or how the Reagan administration then promptly turned around and gave Iran's enemy (Iraq) even more weapons, intel and loans so they could better wage war on Iran. Clinton flip-flopped on issues of sanctioning Iran over supplying arms to the Bosnian conflict and supporting terror groups, sometimes pushing for sanctions and sometimes vetoing them, which isn't as big of a screw-up IMO.