THIS. As the decision and Justice Sotomayor’s dissent make crystal clear, the headline is that the Court is postponing a decision on the merits, ruling the states’ lawsuit was premature. That’s exactly what a 3-0 DC Circuit panel decided earlier (with Obama appointees Millett and Wilkins).
I would urge the national outlets that published headlines suggesting that this recent SCOTUS decision "cleared the way" for Trump's executive order to rethink the accuracy of that headline and change it.