Children of Trump Administration employees got to “Build the Wall” with personalized bricks at a White House pre-Halloween party — and it gave some of their parents a fright.

“Horrified. We were horrified,” a source told Yahoo News Saturday.

The Oct. 25 party in the Eisenhower Executive Office Building included a colorful display of paper bricks, each bearing a tot’s name, taped to the walls of the hallway near the office of digital strategy and the speechwriters’ office.

It was bracketed by construction-style signs reading “America First” and a large cut-out figure of President Donald Trump in a hardhat.

Kid-sized construction vests hung on hooks under a sign reading “Trump’s Crew.”

Children were asked to decorate their “brick” and tape it to the wall, attendees said.

Other offices in the building — including that of Vice President Mike Pence on the second floor — participated in the party with apolitical displays featuring Halloween and other themes.

“Our ceremonial office had a plane display,” a Pence spokesperson said. “We had kids build their own paper airplanes and fly them.”

Trump has pushed to build a wall on the US-Mexico border since the start of his presidential campaign, infuriating critics and energizing supporters.