The president-elect’s proposed border wall with Mexico is expected to cost $100 million, according to a congressional aide briefed on the plan.

Trump would seek to fund the wall with funds from an excise tax, or sales tax.

He also would seek a temporary ban on all travel by U.S. citizens from seven countries.

The aide said Trump will seek to use the tax revenue to hire additional border patrol agents and purchase $10 million in military equipment.