The backstory: This back-and-forth was sparked by the health-care collapse, and McConnell said Monday that Trump had "excessive expectations about how quickly things happen in the democratic process." The previous Trump tweets:

• Wednesday afternoon: "Senator Mitch McConnell said I had "excessive expectations," but I don't think so. After 7 years of hearing Repeal & Replace, why not done?"
• Thursday morning: "Can you believe that Mitch McConnell, who has screamed Repeal & Replace for 7 years, couldn't get it done. Must Repeal & Replace ObamaCare!"