People voted for his rhetoric, now they are going to see just how powerless the office of the president actually is.
He has no concept of how to work with Congress or with the bureaucracy, or how little power a president actually has. aAlso, the president can't spend money he doesn't have (not appropriated), and so most of the wild ideas that Trump has gone on about will simply not happen because there's no money to make them happen.
The way US government works is that a piece of legislation gets proposed, then later on funded. Sometimes the funding does not come until the following year(s) because we have a retrospective tax system, not pay as you go as in the UK. That's the taxation without representation ethos that made the colonies want to break away from England in the first place!
The worse problem with appropriation coming in following years is that bids might go out to contractors, eg to build bridges, highways, etc. Then something happens and the government cannot go back on those contracts once the appropriations are made. That money must be spent on the legislative project approved by congress.
Why does that matter? EG... in the 80s and 90s many military bases were closed to save money. In the mid-1980s I was a clerk of the works on a dorms/barracks improvement project that had been approved by congress and the fund appropriated. The construction took 6 months (there was a lot of asbestos...reason for the rehab). Almost as soon as the new dorms were done... they were abandoned as the base was closed.
Governing in the US is a very long process, not an event. Something The Donald is going to have a very hard time accepting. There will be tears.