One thing about the whole "Art of the Deal" aspect of a Trump candidacy - Trump supporters seem to think he will be able to deal with Congress the way he deals with businesses. But in order to make deals, you first have to have something the other side wants as much as you want what you are asking for. And one big piece of leverage in making business deals it the risk that you will walk away and make a deal with someone else instead. You can't do that with Congress - there is no one else with whom you can deal. All you can do is try to buy off enough votes to get what you want passed.
As a businessman, Trump bought off politicians the old fashioned way - he bribed them with campaign donations. What will he be offering them as president? Would he agree to higher taxes or more restrictive gun laws in order to get some of his immigration policies passed? We already know he doesn't have a long history of opposing such ideas.
One thing about the whole "Art of the Deal" aspect of a Trump candidacy - Trump supporters seem to think he will be able to deal with Congress the way he deals with businesses.
They also don't realized that he is negotiating with them--his voters--and he intends to be on the upside of the "deal".