Help Trump build the wall!
CJam, 52 bytes

F,ri*"s@;b6(MBZF,fu"128b6b"_ 
|-—"f=N/ff=zN*


Includes a bunch of unprintable ASCII characters. The hexdump of the first string literal pushed is:

01 73 06 40 3B 62 36 28 1E 4D 07 42 5A 14 1B 46 2C 66 75


Try it here!

Explanation

The above hexdump is interpreted as a base-128 number, then converted to base 6, to get this list:

[1 1 1 1 0 0 1 1 1 0 0 2
 1 1 1 3 1 1 3 0 3 1 1 3 2
 0 0 0 3 1 1 1 1 1 1 1 3 2
 4 1 1 1 2
 1 4 2
 4 1 2
 5]


To this, we apply the mapping 0 → _, 1 → space, 2 → \n, 3 → |, 4 → -, 5 → —. This gets us the string:

    __   __
   |  |_|  |
___|       |
-   
 -
- 
—


It consists of the "period" of each line; i.e. we can cycle the fifth line " -" to get " - - - - - - - ".

Then, we execute this subprogram:

N/               Split into lines.
  Ff*            Repeat each line 15 times (to cycle it).
     Ff&lt;         Take the first 15 chars of each line.
        rif*     Repeat these chars input() times.
            N*   Join lines.


(The new version does this in a slightly different way that I actually can't wrap my head around myself very well, because it uses ff=.)