Constitutionally, can the President get the border wall built just by executive order without the approval of Congress?

Congress already approved the building of the wall back in 2006. Obama and Hillary both voted yes on it.

See how stupid you are when you let your TV tell you what to think?

congress has already authorized a wall on the border

even hillary clinton as a senator voted for it

Nope.

No. Congress controls the "purse strings".

Yes, but he'd face fierce problems with Congress who he'll need with other things.

Having it done through Congressional approval, assures it can't be overturned by another administration.

The 45th President is going "by-the-Book" instead of ego-driven as the previous administration did.

The Congress already approved it in the Secure Fence Act of 2006. Obama stopped it with an Executive Order. Trump has only canceled that order. The wall will be built.

Not unless he's planning on paying for it himself.

No, but that isn't what's happening.

A law to build a border wall was passed by congress over a decade ago.

there needed to be a bill passed. a bill to have a fence up was passed in 2006. But trump is going to make it a wall.

there is a lot the president can do on his own with executive order, and scary enough, that includes launching a nuclear missile anywhere in the world whenever he wants