Is Building a Wall for Security 'Biblical'?

Exo 14:22 And the children of Israel went into the midst of the sea upon the dry ground: and the waters were a wall unto them on their right hand, and on their left.

When Israel left evil Egypt, the pharaoh and his minions tried to destroy all of them. They were prevented by a pillar of fire and wall of safety that God provided to usher the children of God across the red sea.

1Ki 3:1 And Solomon made affinity with Pharaoh king of Egypt, and took Pharaoh's daughter, and brought her into the city of David, until he had made an end of building his own house, and the house of the LORD, and the wall of Jerusalem round about.

Wise Solomon who built the temple also put a wall around Jerusalem.

2:17 Then said I unto them, Ye see the distress that we are in, how Jerusalem lieth waste, and the gates thereof are burned with fire: come, and let us build up the wall of Jerusalem, that we be no more a reproach.

Walls were essential to the old world and will be in the future world to come:

Rev 21:12       And had a wall great and high, and had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:

Rev 21:14       And the wall of the city had twelve foundations, and in them the names of the twelve apostles of the Lamb.

Rev 21:15       And he that talked with me had a golden reed to measure the city, and the gates thereof, and the wall thereof.

Rev 21:17       And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel.

Rev 21:18       And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.

Rev 21:19       And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;

Rev 22:15 For without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.

Not everyone will be allowed through the gates of God's city and neither should countries allow full access to their cities or nations by illegal immigration. They (countries with open boarders) are only asking for trouble.