President Trump told a crowd of supporters in Alabama on Friday night that his proposed wall along the U.S.-Mexico border would be "see through."

"The wall is happening. In fact, you probably saw, you know, we have a wall up there now, and re-renovating it already. It's being made pristine, perfect, just as good as new, though we may go a little higher than that, but that's OK. And we are building samples of a new wall. You know, it has to be a see-through wall," Trump said.

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"If you can't [see] through it, you don't know who's on the other side. Let's say we build a pre-cast concrete wall and now we have people on the other side," he continued. "It's going to stop drugs. It's going to stop a lot of bad things."

Trump was speaking to supporters at a rally for Sen. Luther Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go MORE (R) ahead of the Alabama Senate GOP runoff on Tuesday.

The president's comments come after he struck a deal with Democrats on the debt ceiling earlier this month, indicating that it would not include funding for a border wall.

Trump has repeatedly promised that Mexico would pay for the wall, however Mexican President Enrique Peña Nieto has said his country will not pay for the construction of the wall.

Congress has not yet fully funded the project.