I'm honestly not sure how much Mitch McConnell listens to him or cares what he says. When Trump called for an end to the legislative filibuster, McConnell rejected the idea out of hand. When Trump called for repeal and replace to be separated, McConnell at first refused and then agreed to try it only when it became clear that no replacement was going anywhere - even though it appears to be a tough road to get to 50 votes on the repeal-only bill.
So now that McConnell has given up on a replacement and is content to schedule a vote on the seemingly doomed repeal-in-two-years-and-replace-with-AHCA-unless-we-can-agree-on-something-else, Trump is making it clear he won't accept that a deal on a replacement is impossible. He wants to Senate to get back in there and make it happen, and not take a summer break until they do:
“Any senator who votes against starting debate is really telling America that you’re fine with Obamacare,” Mr. Trump said before a lunch with the senators Wednesday. He gestured at one wavering GOP lawmaker, Dean Heller of Nevada, saying, “He wants to remain a senator, doesn’t he?” and warned lawmakers not to leave town in August without a deal.