Donald Trump laid out new details in a pre-taped interview that aired Wednesday about the border wall he has called to be built on the U.S.-Mexico border.

"I think the height could be 35 to 45 feet. That's a good height. That's a good height. Anywhere in that neighborhood. Could be higher," Trump told Fox News' Sean Hannity during the second part of an Austin, Texas, town hall.

The Republican nominee said he plans to install a fence along 1,000 miles of the 2,000-mile border because only that portion needs to be reinforced.

Trump said the current border allows drug cartels to bring drugs into the U.S. and take their money back out with them.