Just saw today that EPA is indefinitely postponing the publishing of Trump's new Waters of the US rule due to the shutdown. Since it will need to go through a lengthy public comment period followed by an even lengthier response period (given there will likely be thousands of comments) before it can become effective, every day the shut down is in effect is another day Obama's Water rule is in effect.
Also, if it the shutdown does drag on it could easily prevent Trump's new the rule from becoming finalized until after the 2020 election and a Dem president would be able to kill it at that point.
One thing Trump is probably too stupid to realize is that the executive branch is what is effected by the shutdown. He's basically shut down many of his appointees.
It’s all about him!
And locking you know who up. And Orange and his Energy guy don't know what EPA is or does.