This is exactly why Trump has been holding on to the ]DECLAS[ docs. He uses anything and everything for a bargaining tool. In public he'll give them DACA, but he'll hold off on the ]DECLAS[ for a while if they give him the wall funding.
And if they hold firm on the wall, then he'll shut down the government (which his supporters won't mind at all), blame it on the Dims, and release the documents. The MSM and their base will be so blindsided by all of this, they'll beg Trump to do the wall deal before he releases anything else.