On the Hillary Clinton footnote on building a barrier - fact check:
However, there are significant differences between the fence Clinton voted for, and the wall Trump pitched during the campaign, which he promised would be an impenetrable, physical, tall and "beautiful" wall that Mexico would pay for.
The plans Trump articulated for the wall during the campaign were somewhat vague and inconsistent.
He said the wall didn't need to run the nearly 2,000 miles of the border, but about 1,000 miles because of natural barriers. He said it could cost between $8 billion and $12 billion, be made of precast concrete, and rise 35 to 40 feet, or 50 feet, or higher.
In any case, Trump himself criticized the 2006 fence as too modest during the 2016 election. "Now we got lucky because it was such a little wall, it was such a nothing wall, no, they couldn't get their environmental -- probably a snake was in the way or a toad," Trump said. (Actually, the project didn’t face environmental hurdles; we rated that part of the claim Mostly False.)