Construction crews working on a new helipad at the White House have taken apart the massive granite seal that would serve as the new landing spot for Marine One, signaling potential delays in the project. Photos captured by The Associated Press on Wednesday show construction workers using a jackhammer on the helipad, which no longer carries the dark gray trim of a presidential seal that was visible last week. It was unclear why the seal was being removed. The White House said it’s continuing to make improvements as part of efforts to best match the needs of the building and its grounds. Trump has said the helipad is needed because new helicopters in the fleet used for Marine One are so powerful they rip out the South Lawn grass.