Trump's Bollard Fence Design (steel slat picket-fence) for which he has agreed $1.3 billion for 55 miles of fence: [link to cdn.cnn.com (secure)]

Easily breached for personnel entry by either cutting or winching slats apart. Also hard to detect a breach. Cut slats simply put back in place to conceal any entry location. Climbers know exactly what's on the other side. There is a video posted on the internet of a tall bollard design that looked impressive but then showed illegals climbing up it with ease, much like climbing a palm tree.



Meanwhile, Israel's concrete wall/barrier paid for by US tax payer dollars in US aid, is much harder to breach. Not easy to cut or to winch apart. Must go over or under, or blow a hole in a section. Harder to conceal entry points. Climbers don't know what lies on the other side (large drop, sharp objects/brush) until they've reached the top.

[link to i2.wp.com (secure)]