The administration of US President Donald Trump has filed an emergency motion to resume construction on its White House ballroom, arguing that completing the work is necessary for national security. The motion argues that a recent court decision to suspend construction in relation to national security concerns is "shocking, unprecedented, and improper". It also outlines various security measures, including drone-proof roofing materials and glass meant to withstand bullets and blasts. The court filing was part of a response from the Trump administration to a March 31 ruling by Judge Richard Leon, an appointee of former Republican President George W Bush. The judge dismissed the administration's claim that leaving the construction site incomplete would "imperil national security".