Unable to get the votes, mostly but not only because of the intransigence of the Freedom Caucus, seconded by the dismay of the moderates.
Trump and the Republicans could not deliver, he on his campaign promises, they on seven years of promises, to repeal Obamacare.
Trump blames the Democrats and predicts Obamacare will explode, this year.
Trump asked Ryan to pull the vote on the bill, laying blame at the feet of Democrats in an interview with the New York Times moments after making the decision.
With any luck, this is a sign of the utter collapse of the Trump presidency and the descent of the Republicans into bitter, impotent divisions, resulting in the failure not only of his agenda but also of theirs.