Trump is neither a king nor a dictator. Congress must appropriate money for the wall. Trump cannot wave a gun or a magic wand to force Congress to act.
That brain-dead morons like Coulter won't vote for Trump because they don't understand how our Constitutional Republic works, is of zero consequence.
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Suggest sparing us your moralizing about the constitution,
as the mechanics of lawmaking are certainly not a mystery.
The issue is hardly the process, its the ability of the person
making the case to persuade against any and all odds;
whether their instrument be fear, reason or self-interest.
From Imperial Rome to Richelieu, Madison, Disraeli and
Von Bismarck, great leaders always found a way to persuade!