Yes he is.
And as far as making Mexico pay for it, that would be nice.
But not as important as just doing it.
10 or 15 billion is ridiculously cheap to save the U.S.
The wall will be way less than $10B.
Trump has said all along that Mexico will pay for the wall:
Donald J. Trump; Verified account
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Mexico will pay for the wall!
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3:31 AM - 1 Sep 2016
A lot of us take 4-5 years to pay for a car and 20-30 years to by a house. That doesn’t mean we aren’t paying for them. Si, they’ll pay.