There are lots of opinions, conspiracy theories, facts and fiction spread around on the Internet and elsewhere. It is really hard to know what is on the President's mind
or anyone else's for that matter but there are many environmental groups that are in favor of land closure, and other examples of wanting things done their way.
There have been closures of lots of government land, roads, national forests and all kinds of restrictive laws on tobacco, vitamins, drugs, behavior etc.
I am not aware of any such new law in Congress, but as these bills come up for discussion and votes, be assured many will rise up against them. An example is gun
rights, every time they come up for discussion, some representatives are voted out of office.
So to answer your question, I don't see any closure such as you mention being worked on, but if you can find the article and post it we will all go to work.
Rich