A spokesperson for the exhibit that the image was not approved.
The Pittsboro property owner who allowed the flag has canceled his lease with the billboard company who allowed the "Black Lives Matter" message.
"We won two World Wars, two World Wars, beautiful World Wars that were vicious and horrible, and we won them out of Fort Bragg, we won them out of all of these forts and now they want to throw those names away," Trump said.
The Pentagon on Friday will ban displays of the Confederate flag on military installations.
President Donald Trump bristled at a reporter's question about police killing African Americans and defended the right to display the Confederate flag as he continued to play into racial divisions in a pair of interviews.
A "Black Lives Matter" billboard has been put up next to a massive Confederate flag flying on U.S. 64 in Pittsboro.