Inept blunder followed by arrogance. As POTUS, Trump took an oath to "...faithfully execute the Office of President of the United States" which includes the execution of existing law,  including the Affordable Health Care Act.
Opposition to AHCA without recommendation to revise and/or replace its provisions is wholly irresponsible, particularly by those within the GOP who voted for its demise without consequence which equates to shameful political posturing. 
This sordid chain of events recalls former Speaker of the House Sam Rayburn quote: "Any jackass can kick down a barn, but it takes a good carpenter to build one."