What republicans congressmen and voters want or don't want is open to debate but the president putting preconditions on a deal just makes any type of deal that much harder. Even without Trump's conditions, coming up with a deal is going be difficult.
So what your saying is that Trump isn't entitled to get anything he wants out of the deal. Do you understand the point of making deals? Do you agree to a mortgage with the bank if you don't get a house to live in?
Many House republican want no part of DACA and Democrats in the Senate can block the legislation if DACA is not included. When you throw the wall into the mix, and a radical reduction in legal immigration, you get no democrat votes in the Senate and a half dozen or more republican voting no.
If not enough of them vote "yes," then a lot of DACA people will be going to Mexico. That's the deal.
Seems to me we're going to be looking at a shutdown in a few weeks with eventual passage of the bill that includes DACA some money for the Trump wall, a slight modification of sponsorship, and a reduction in size of the immigration lottery.
However if Senate Democrats really want to win the midterms, they need to refuse any funding for Trump's wall and compromise somewhat on sponsorship and the lottery but not DACA. That will force Trump to veto any legislation and start deportations of dreamers. There is nothing that would help democrats more in the the midterms than front page stories of young people being separating from their families and the only home they have every known because of the illegal acts of their parents.
The voters are not going to take kindly to the party that shutdown the government for the sake of illegal aliens. Polls show that voters overwhelmingly support the deal Trump is offering. Dims reject it at their peril. If they do, taking them down in 2018 will be like shooting fish in a barrel. I hope the shutdown lasts right up until the election.