By Aaron Blake, CNN

Donald Trump has been inconsistent in his rhetoric around the need to secure Iran's highly enriched uranium.

Analysis - As the United States and Iran try to hammer out a deal to start winding down the war, few particulars loom as large as what happens with Iran's nuclear stockpile.

It's not only a major point of contention - with Iran signalling it won't turn over its highly enriched uranium - but extracting it could be very complicated. And the fate of these materials will go a long way toward determining just how much President Donald Trump's war has truly "obliterated" Iran's nuclear threat.

But as with many of its other goals, the Trump administration has been very inconsistent about its demands on this one.