This is why the government shutdown gambit may backfire against the Dems. The Dems "support" the Dreamers only as political fodder - if they truly wanted to help them they would negotiate and cut a deal the President can sign. It isn't that hard - normalizing the Dreamers isn't the sticking point, it is the border security and changes to the legal immigration rules that the Dems won't accept as a quid pro quo.
Meanwhile, if the government shuts down, the Dems priorities will be laid out in stark relief - screw the military, let 'em take bullets without pay, all to "protect" a small number of illegal immigrants from a deal that would give both sides a victory. Yes, a majority of folks are sympathetic to the unique plight of the Dreamers, but a majority also favor increased border security and a rollback of three decades of neglect regarding enforcement of law regarding illegals. A deal can and should get done - unless the Dems are too stupid or cynical to budge.